NASM-SFC cheat sheet

Flexibility is the extensibility of soft tissue permitting full ROM; mobility adds neuromuscular control and joint stability through that range, so stretching alone does not create lasting mobility.

Static stretching: slow, held 15-60 s at the point of tension (not pain); repeated 2-4 sets; acute ROM gains last roughly 10-30 minutes and are largely neural (stretch tolerance), not permanent tissue lengthening.

Dynamic stretching: controlled, movement-based, sport-specific drills through progressively larger ranges; best placed in the warm-up because it raises tissue temperature and primes neuromuscular patterns without the acute force decrement seen after prolonged static holds.

Pre-activity rule: holds longer than ~60 s per muscle group immediately before maximal or power output can transiently reduce force and power; keep pre-event static work brief (<30-60 s) or use dynamic drills.

PNR/contract-relax (an advanced proprioceptive neuromuscular technique): 5-10 s isometric contraction at end range, brief relaxation, then move to a new end range; repeated 2-3 cycles; gains at least equal to static stretching, with a small risk of delayed-onset soreness.

Ballistic stretching uses rapid, bouncing end-range motion and triggers the stretch reflex (muscle spindle-mediated contraction); it is generally reserved for advanced individuals with sport-specific needs, not for general or deconditioned clients.

Autogenic inhibition: sustained tension on the Golgi tendon organ raises its inhibitory signal to the muscle, allowing greater relaxation and range; reciprocal inhibition: contracting the agonist reduces antagonist tone (contract-relax leverages both).

The stretch reflex is governed by muscle spindles; a rapid stretch increases spindle firing and reflexive contraction, so slow, controlled application of tension is the default coaching cue for safe range gains.

Joint-specific norms: the hamstrings commonly need 30-60 s holds; the hip flexors and pectorals respond well to 2-4 sets of 30 s; the calf complex often needs longer cumulative time (2-3 min per side) for durable change.

Screen before stretching: use active straight-leg raise, overhead squat, and passive/active ROM comparisons; a range that is available passively but not actively signals a motor-control problem, not a tissue-length problem.

Decision rule: if passive ROM exceeds active ROM by a large margin, prioritize activation and motor control of the new range; if both are limited, address tissue extensibility with stretching plus soft-tissue work.

Static stretching is best placed after activity or in a separate session; dynamic and sport-specific drills belong in the warm-up; PNR/contract-relax fits between the two as a pre-activity range primer when held briefly.

Dose-response: 2-4 repetitions of 30-60 s per muscle group, 2-3 days per week minimum, accumulating roughly 5 minutes total per muscle group per session for meaningful ROM change over 4-6 weeks.

Progression rule: increase hold duration or repetitions only after the client can hold the current dose without compensations (breath-holding, pelvic tilt loss, joint pain); never progress range by pushing into pain.

Contraindications to aggressive stretching: acute muscle strain or joint sprain, unhealed fracture, joint hypermobility or instability, acute inflammation, and sharp or radiating pain; use caution with osteoporosis, recent surgery, and pregnancy.

The hypermobile client needs stability, not more length: emphasize end-range control, isometric strengthening, and reduced passive end-range holds; stretching into an already excessive range worsens the problem.

Coaching cues that raise compliance and safety: exhale into the stretch, keep the target muscle relaxed, avoid bouncing, keep the spine neutral, and hold at the first point of tension rather than the point of pain.

Measure outcomes with objective tests (sit-and-reach, ankle dorsiflexion wall test, active straight-leg raise angle) at baseline and after 4-6 weeks; progress is judged by active ROM and function, not by passive range alone.

Warm-up sequence: 5-10 minutes of light aerobic activity to raise core temperature, then dynamic drills, then sport-specific movement preparation; static holds are optional and brief if used at all.

Tissue temperature matters: warmer tissue tolerates more elongation with less force, so stretching after light activity or a hot shower is more effective than stretching cold tissue.

Force-velocity caution: prolonged static stretching immediately before jumping or sprinting can reduce power output for up to ~10 minutes; separate static work from power events by at least 10 minutes or use dynamic alternatives.

Foam rolling before static stretching can temporarily increase ROM without a force decrement; rolling after activity supports recovery but does not replace a stretching program for tissue length.

Breathing and the nervous system: slow diaphragmatic breathing reduces sympathetic drive and improves stretch tolerance; breath-holding increases muscle guarding and limits range.

Session structure for a flexibility-focused session: general warm-up, targeted soft-tissue work, static or PNR stretching for 15-20 minutes total, then active end-range control drills to make the new range usable.

Recovery and frequency: ROM adaptations require repeated exposure; 2-3 sessions per week maintain gains, and gains regress within a few weeks if stretching stops, so build it into the client's routine.

Document dose and response (technique, hold time, sets, ROM measure, pain rating) each session so program adjustments are based on data rather than feel.

Static stretching protocol: move slowly to the point of tension, hold 30 s (range 15-60 s), 2-4 sets, breathe normally, relax slowly; stop at sharp pain, numbness, or tingling.

Dynamic stretching protocol: 8-12 repetitions per drill, controlled tempo, gradually increasing range across repetitions; the drill should mimic the demands of the activity that follows.

PNR/contract-relax protocol: lengthen to end range, contract the target muscle isometrically for 5-10 s at roughly 20-50% effort, relax 2-3 s, then move gently to a new end range; 2-3 cycles.

Agonist-contract protocol: contract the opposite muscle group to the one being stretched (e.g., contract the quadriceps while stretching the hamstrings) to use reciprocal inhibition and gain range.

Passive (static) stretching requires an external force (coach, strap, gravity); active stretching uses the client's own agonist contraction to hold the range; active-assisted combines both and is useful for teaching end-range control.

Self-myofascial release parameters: apply sustained pressure to a tender point for 30-60 s, 1-2 sets, and avoid bony prominences, the lumbar spine, and areas of acute injury or varicose veins.

Coach body mechanics and safety: keep the client's joint supported, move the limb slowly, ask for feedback on tension versus pain, and never force an end range the client cannot control.

Terminology check: flexibility = range of motion of a joint or series of joints; stretching = the technique used to influence it; mobility = flexibility plus strength and control; stability = the ability to resist unwanted movement.

Ankle dorsiflexion wall test: knee-to-wall distance; limited dorsiflexion (<~10 cm or 4 in) shifts the body forward and is linked to altered squat and landing mechanics; address with calf stretching and ankle mobility drills.

Hamstring length: passive straight-leg raise and sit-and-reach; compare left and right and compare passive with active range to decide between tissue-length and control interventions.

Hip flexor length: modified Thomas test; an anterior pelvic tilt and lumbar extension during overhead movements often indicate short hip flexors, so include hip flexor stretching before overhead work.

Pectoral and thoracic mobility: a rounded, internally rotated shoulder position limits overhead reach; combine pectoral stretching with thoracic extension drills rather than stretching the shoulder joint itself.

Overhead squat screen: look for forward lean, heel lift, and arm fall; if the arm fall resolves with a dowel or a narrower grip, the limitation is more likely thoracic/shoulder mobility than motor control.

Lumbar spine caution: repeated end-range lumbar extension or flexion in stretching can aggravate symptoms; keep the pelvis neutral and coach hip hinge mechanics when stretching the hamstrings.

Client education point: stretching should feel like a mild-to-moderate pull (about 3-5 on a 0-10 scale), never sharp pain; pain above that threshold triggers protective muscle guarding and defeats the purpose.

Program design variables: frequency (2-3+ days/week), intensity (point of tension), time (30-60 s holds, 2-4 sets, ~5 min per muscle group), type (static, dynamic, PNR, active), and progression (longer holds or new ranges).

Session order rule: dynamic before activity, static after activity or in a separate session, PNR as a brief pre-activity primer; never place prolonged static holds immediately before power testing.

Goal-based selection: for general health and posture, static plus active stretching 2-3 days/week; for sport performance, dynamic warm-up plus post-session static work; for rehabilitation, defer to the medical provider and use low-load, pain-free range.

Progression and regression: progress by increasing hold duration, adding sets, or adding active end-range control; regress by shortening holds, using supported positions, or reducing range to a pain-free point.

Reassessment interval: retest ROM every 4-6 weeks with the same measurement method; if active ROM has not improved, change the dose or address strength and control before adding more stretching.

Special populations: older adults benefit from daily low-intensity static and dynamic work to offset age-related stiffness; youth need dynamic warm-ups and should avoid maximal end-range loading; pregnant clients should avoid supine long holds and extreme ranges.

Integration with strength training: strength work performed through a full range can improve flexibility as effectively as static stretching, so pair stretching with controlled full-ROM resistance exercise rather than relying on stretching alone.

Common error: bouncing at end range; correction is to hold steady tension and cue slow breathing, because bouncing triggers the stretch reflex and increases injury risk.

Common error: stretching into pain; correction is to reduce range to the first point of tension (3-5/10) and reassess, since pain causes guarding and reduces gains.

Common error: breath-holding; correction is to cue a slow exhale during the hold, which lowers sympathetic tone and improves stretch tolerance.

Common error: compensating at another joint (e.g., posterior pelvic tilt during a hamstring stretch); correction is to support the segment and reduce range until the compensation disappears.

Common error: stretching a hypermobile joint; correction is to replace passive end-range holds with isometric strengthening and end-range control drills.

Common error: doing only passive stretching and never using the new range; correction is to add active and loaded end-range drills so the nervous system retains the range.

Common error: skipping the warm-up before stretching; correction is to perform 5-10 minutes of light activity first, because cold tissue tolerates less elongation.

Static stretching: slow, sustained, 15-60 s holds; primary uses are post-activity cool-down and general ROM improvement; low injury risk; may transiently reduce power if prolonged before activity.

Dynamic stretching: controlled, movement-based, 8-12 reps; primary use is the warm-up; raises tissue temperature and primes movement patterns; low risk when controlled and sport-specific.

Ballistic stretching: rapid, bouncing end-range motion; reserved for advanced, sport-specific needs; higher risk because it provokes the stretch reflex; not for beginners or deconditioned clients.

PNR/contract-relax: isometric contraction at end range then relaxation into a new range; effective for ROM gains but requires coaching skill and carries a small risk of soreness.

Active and active-assisted stretching: the client holds or assists the range with their own muscle contraction; best for building usable range and end-range control; lower passive-tissue stress.

Self-myofascial release: sustained pressure with a roller or ball for 30-60 s per tender point; improves short-term ROM and reduces perceived tightness; avoid acute injury sites and bony prominences.

Selection rule: choose the technique by goal and timing (dynamic pre-activity, static post-activity, PNR as a brief primer), and by client status (hypermobile clients need control work, not more passive range).