If your Achilles is stiff and sore for the first 10 steps out of bed, and tender about 2–6 cm above the heel, that’s an early overload warning. Don’t ignore it, and don’t ruck through it. Most candidates keep piling on mileage until a small flare-up becomes a 6-week layoff. Fix it in week one: - Cut ruck volume 30–50% and drop hills for 1–2 weeks. Don’t stop completely. - Keep running easy as long as the pain stays mild. - Do slow heel raises on a step, 3 seconds up and 3 seconds down: 3x15 with a straight knee, then 3x15 with a bent knee, once a day. - Add weight in a backpack only once those feel easy. Sharp pain, swelling, or a pop or snap means stop and see sports med or a PT. This is general guidance, not medical advice. Rucking loads your calf and Achilles hard, so catching a small flare early costs far less than a forced layoff before selection. What’s the first body part that flares up when your ruck miles climb, and what did you change that actually fixed it? Drop it below, along with your current weekly ruck mileage. If you want to work through your own numbers live, bring them to this week’s Coffee Hour.

How to run it: use a flat route or track and keep the same effort the whole way, around 70-75% of max HR (you can speak in full sentences). Record your average pace and average HR for each half. Example: 9:30/mi at 142 bpm in the first half, 9:30/mi at 154 bpm in the second half = about 8% drift. - Under 5%: Your base is solid. Add duration or pace, not both. - 5-8%: Keep building easy volume. - Over 8%: Your easy days are too fast, or you need more weekly volume. Retest every 4-6 weeks on the same route. SFAS is hours of sustained movement under load. The candidate whose heart rate creeps up in hour one is the one fading in hour six. (This is a general coaching rule of thumb, not official doctrine.) Run this test this week and comment with your pace, your average HR first half vs. second half, and your drift %. Bring your results to Coffee Hour and we'll look at what to fix next.

If every ruck you do is on flat pavement, you're training for a test you won't take. Selection movement happens on uneven, loose ground (sand, pine duff, ruts, rolling terrain), and pavement never trains the small stabilizers that keep your ankles and knees working under load. The fix: make ONE of your weekly rucks off-pavement. • Use a trail, sandy path, or soft dirt road. Keep pavement for pace work only. • Start at about 45 lbs (dry weight) and expect to run 1-2 min/mile slower on soft ground. That's normal. Don't chase pace. • On your longest ruck, look for roughly 500-1,000 ft of climbing over 8 miles. • Train the downhills: short steps, soft knees, no heel-slamming. Descents are where quads and shins fail first. • Add 2 sets of 10 single-leg calf raises and 30-second single-leg balance holds per side, 3x per week. This is general training guidance, not official doctrine. Adjust to your own body and build up gradually. Your turn: what's the worst surface you've ever rucked on, and what gave out first (ankles, knees, shins, or feet)? Drop your surface, distance, and load below. Bring it to this week's Coffee Hour and we'll break down fixes.

Every step under a ruck is a single-leg lift. Your trap bar deadlift can look great while one leg quietly lags, and that gap is where knees, hips and shins break down at mile 10. The fix: add single-leg strength twice a week. Benchmark: rear-foot-elevated split squat, 8 reps per side, with dumbbells totaling about 50% of your bodyweight (180 lb = 90 lb total, 45 in each hand). Lower for 3 seconds, no wobble, no torso collapse. Film it from behind. The rules: 1. The weaker leg sets the reps. Start with the weak side and match the strong side to it, never the other way around. 2. Keep the side-to-side gap within about 10% on reps or load. 3. The slow 3-second lowering is what prepares your quads and knees for downhill miles under load. 4. Do it on your lower day, not the day before a long ruck. 5. If one side is clearly behind, add a third set to that side only. Your turn: what's your split squat number per side, and which leg is the weak one? Drop it below. If you've already closed a gap, tell us what you changed.

Most guys think speed work is what gets them ready for selection. It's not — your aerobic base is the single biggest factor in how you perform at SFAS, and most candidates build it wrong. Here's the mistake: hammering every run at max effort. That stalls the exact adaptation you need and burns you out before you even report. The fix is going slower on purpose — roughly 80% of your weekly running and rucking volume should sit at an easy, conversational pace (think 8:45-9:30/mile for most guys), with only about 20% spent on genuinely hard efforts. You're aiming for a 5-mile run in 35-40 minutes and a sub-13:00 two-mile as competitive benchmarks, but you get there by accumulating 6-10 hours a week of low-intensity work, not by redlining every session. This matters because SFAS doesn't test you fresh — it tests your aerobic engine after days of rucking and sleep deprivation. Guys with a big base recover between events; guys who only trained fast crash. What's your current 5-mile time, and honestly — how much of your weekly mileage is easy pace versus hard effort?