Six Weeks to a 45-Minute Pack Test
A 41-year-old wildland firefighter must pass a 3-mile pack test carrying 45 lb in under 45 minutes. The test is 6 weeks away. His current best unloaded 3-mile time is 32:00; with 45 lb it is 52:00. He works 10-hour days, sleeps about 6.5 hours, and does CrossFit four times weekly but no long walks or pack marches. Estimated maximum heart rate is 179 bpm. He has no current injury, but his calves cramp on long efforts. His agency requires the test on a measured road course with rolling hills. He wants a plan that does not interfere with his job and asks whether he should run or walk the test. He has a history of exertional heat illness two summers ago.
1. Calculate the required pace and design the weekly conditioning plan, including pack loads and interval structure.
Read the worked answer
Required pace: 45 min ÷ 3 miles = 15:00/mile. Current pack pace: 52:00 ÷ 3 = 17:20/mile; the gap is 2:20/mile. Unloaded pace is 10:40/mile, so he has aerobic capacity but lacks pack-specific efficiency and durability.
Weekly plan: two pack interval days (for example, 4×0.75 mile at 14:45–15:15 with 3 min rest, starting at 25–30 lb and progressing to 45 lb), one long pack walk (start 2 miles, build to 3 miles at 15:30–16:00), one easy 45–60 min walk or cycle. Keep CrossFit to 2 days and remove metcons within 24 hours of pack work. Use RPE 6–7 and nasal breathing where possible.
2. Should he run or walk the test, and what fueling, hydration, and heat precautions apply?
Read the worked answer
He should walk the test unless he can run the full 3 miles with 45 lb in training; running increases calf strain and heat production. His current pack time is a walking effort, and the required 15:00/mile is achievable with brisk walking on rolling terrain.
Fueling and hydration: 400–600 mL/h with sodium, and 30–60 g carbohydrate/h for long training walks; practice this before the test. Sleep 7+ hours for the last two weeks. Because of his exertional heat illness history, avoid midday heat, pre-cool, and know warning signs. Test-day pacing should target even splits rather than a fast start.
3. How do you progress pack load, and what is the taper?
Read the worked answer
Progress load gradually: week 1 at 25 lb, week 2 at 30 lb, week 3 at 35 lb, week 4 at 40 lb, week 5 at 45 lb. If calf cramps or gait changes occur, hold the load for a week rather than pushing forward. The longest pack walk should reach 3 miles at 45 lb by the end of week 5.
Taper: in the last 5 days reduce volume 50%, keep one short 1-mile pack walk at test pace, and avoid heavy CrossFit. Test-day goal is 14:45–15:00/mile with even splits.