How to Prepare for SFAS
Special Forces Assessment and Selection is roughly three weeks long and most of what it measures is not fitness. Fitness is only the thing that keeps you in the running long enough to be measured on the rest.
What the course actually is
SFAS runs about three weeks and is usually described in three overlapping phases. The exact length, sequence and content change from class to class and are not published in detail on purpose — part of what is being assessed is how you behave when you do not know what is coming or how long it lasts.
| Phase | Roughly | What is being looked at |
|---|---|---|
| Individual events | First week | Fitness testing, runs, rucks, obstacle course, swim. A screening filter more than an evaluation. |
| Land navigation | Middle | Day and night navigation over distance, alone, under time. Pass/fail in effect, and the largest single source of attrition after the body. |
| Team week | Final stretch | Long group problems with heavy awkward objects and not enough information. This is where the assessment actually happens. |
Understanding that order matters, because it tells you what to train. The first week eliminates people who are not fit enough. The middle week eliminates people who cannot navigate. The last week decides who gets selected — and by then everyone left is tired, everyone is sore, and the only variable is what kind of person you are when that is true.
You cannot be selected for being the fittest person there. You can absolutely be eliminated for being unfit, injured, lost, or insufferable. Train so that fitness stops being the thing that can end your course, then work on everything else.
The numbers people train toward
These are the standards the Special Forces Assessment and Selection Preparation Handbook publishes, and the handbook prints a goal beside each minimum for a reason: arriving at the minimum is not the same as arriving prepared.
SF Physical Fitness Assessment
Taken about a week before selection starts.
| Event | Minimum | Goal |
|---|---|---|
| Hand-release push-ups | 28 | 48 |
| Pull-ups | 6 | 14 |
| Two-mile run | 15:12 | 13:30 |
What to arrive with
| Event | Minimum | Goal |
|---|---|---|
| Five-mile run | 40:00 | 37:30 over rugged terrain |
| Twelve-mile foot march, 45 lb plus food and water | 3:00 | 2:36 |
| Army Fitness Test | 400, with 80 per event | 473 |
Look at that AFT line for a moment. Four hundred points with eighty in every event is a long way above the Army’s 300-point general standard and above the 350 required of combat MOSs — and 473 is the stated goal. Score your current test and you will know immediately whether fitness is your problem or whether it is one of the other things.
Notice the foot march too. Across the research on selection outcomes, road march times account for more of the difference between selected and non-selected candidates than any other measured event. If your training hours are limited, they go into rucking and the aerobic base that supports it.
A twelve-month build
A year is the honest minimum for someone starting from ordinary military fitness. Two years is common among people who do well. The structure below is deliberately unexciting, because the thing that works is unexciting.
Months 1–4 — base
Aerobic volume and tissue tolerance. Most running easy enough to hold a conversation. One long ruck a week, starting wherever you are — four miles at 35 lb is a legitimate starting point — adding roughly a mile a week with a lighter week every fourth. Strength twice a week, basic and heavy: a squat, a hinge, a press, a pull. No ruck running. No hero workouts.
Months 5–8 — specificity
The long ruck keeps growing toward 12–15 miles. Add a second, shorter ruck at goal pace or slightly quicker — three to five miles at 12:30 to 13:30. Runs split into an easy long run, a tempo run, and intervals. Strength shifts toward what a loaded body needs: heavy carries, single-leg work, the posterior chain, grip. Start doing land navigation for real, on the ground, in the dark, at least monthly.
Months 9–11 — assembly
Stack fatigue on purpose. Ruck the morning after a hard run. Do the long ruck on four hours of sleep once a month, because that is the condition you will be graded in. Practice the whole kit: the boots you will wear, the socks you will wear, the actual load, foot care done properly every time. Test a full 12-mile at goal pace every three or four weeks.
Month 12 — arrive intact
Volume comes down, intensity stays. The last four weeks are for showing up healthy, not for last-minute fitness that does not exist. Nobody has ever been selected because of what they did in the final fortnight; plenty have been sent home because of it.
The most common way to fail selection is to never attend it. Stress fractures, Achilles problems and lower back injuries in preparation are overwhelmingly caused by adding load, distance and pace at the same time. Add one variable at a time and take the down weeks even when you feel fine — especially when you feel fine.
What a training week looks like
| Day | Session |
|---|---|
| Monday | Strength — lower body focus, heavy, low reps |
| Tuesday | Run — intervals or tempo |
| Wednesday | Short ruck at goal pace, 3–5 miles |
| Thursday | Strength — upper body, pull-up volume, carries |
| Friday | Easy run or swim |
| Saturday | Long ruck — the week's main event |
| Sunday | Off, or walk and mobility |
Land navigation goes wherever it fits, usually replacing part of a weekend. If a week has to be cut short, the long ruck is the session that survives.
Why people actually go home
- Feet. Far and away the leading preventable cause. Boots that were never broken in, socks that were bought the week before, blisters that were ignored for a day. There is a whole discipline to this and it is learnable in advance.
- Land navigation. Entirely a skill, entirely trainable, and routinely neglected by people who spent the year running. Pace count, terrain association and honest night practice are worth more than another five pounds on the deadlift.
- Voluntary withdrawal. Most people who quit do so in a specific, predictable window — cold, wet, sleep-deprived, and unsure how much longer it goes on. Knowing the window exists is most of the defense against it.
- Being difficult to be around. Team week is graded by people watching how you behave when you are exhausted and someone else is failing. Loud, sullen, selfish or invisible all read the same way on a form.
Train the whole thing, not just the running
Lensatic carries the 12-week SFAS Prep plan and Road to 12 Miles, tracks runs and rucks by GPS with splits and heart-rate zones, grades land navigation practice against your plotted points, and puts your current numbers next to the SFAS standards on one screen. The Learn tab covers land nav, foot and load care, casualty care and the rest of what gets overlooked.
See what's in the app Ruck pace calculatorQuestions
How long is SFAS?
Roughly three weeks, commonly described as around 21 days. The precise length and sequence vary between classes and are not something to plan around — assume it lasts until it is over.
How long should I train before attending?
A year of structured preparation is a reasonable minimum from a normal military fitness base. Many candidates who do well have been training specifically for two years or more.
What is the hardest part?
It depends entirely on the person, which is part of the design. Physically, most people point at land navigation for the distance covered alone and at team week for cumulative fatigue. The most common self-reported reason for quitting is not any single event but not knowing when it ends.
Do I need to be a strong swimmer?
You need to not be a liability in water. Comfort matters more than speed — being calm, clothed, in a pool is the bar to clear before you worry about technique.
Is this official Army guidance?
No. This is a preparation guide published by Deadlift Digital LLC, with no affiliation with or endorsement by the Army or Department of Defense. Use your recruiter, your orders and your chain of command as the authority on anything official.