Special Populations
Who needs modification
Older adults face sarcopenia and balance loss, so include progressive resistance training two to three times weekly plus balance work and moderate aerobic activity. Youth should build technique and general fitness; heavy maximal loading is generally deferred until physical maturity, and long-duration endurance work is discouraged. Clients with obesity benefit from low-impact modes that spare joints. Clients with osteoporosis should avoid loaded spinal flexion and rotation, favoring upright, supported work.
Cardiovascular and metabolic conditions
Hypertension: avoid breath-holding (Valsalva) and heavy overhead pressing, emphasize steady aerobic work, and do not train clients with uncontrolled pressure - commonly at or above 180/110 - without medical clearance. Diabetes: monitor glucose, inspect feet, and know hypoglycemia signs (shakiness, sweating, confusion, hunger) versus hyperglycemia (thirst, frequent urination, fatigue). Cardiac clients train by perceived exertion or symptom monitoring under physician guidance.
Pregnancy
Moderate-intensity activity is generally encouraged with clearance; avoid supine exercise after the first trimester, avoid Valsalva and breath-holding, and avoid contact or fall-risk activities.
Traps and a rule of thumb
Stems like to test whether you would “push through” a red flag - you would not. Rule of thumb: blood pressure at or above 180/110, chest pain, dizziness, or unexplained shortness of breath means stop and refer. Worked example: a pregnant client in her second trimester should perform seated or standing rows rather than supine bench work.