The Question Everyone Has But Never Asks Out Loud
You get to the gym and somehow it's been two hours. Or you're done in 35 minutes and wondering if you've even done anything. Neither feels quite right.
How long should a workout actually be?
The honest answer: it depends on your goal, training experience, and split. But "it depends" is a cop-out, so let's get specific.
What the Research Actually Says
The evidence on workout duration is less clean than fitness content makes it seem. A few things are well-established:
Muscle protein synthesis responds to volume, not time. What drives hypertrophy is the number of *hard sets* you do per muscle group per week — not how long you're in the building. A 45-minute session with 18 well-executed sets beats a 90-minute session padded with long rest breaks and phone scrolling.
Testosterone and cortisol. There's a widely repeated claim that workouts longer than an hour tank testosterone and spike cortisol to destructive levels. The research on this is overstated. Cortisol rises during any hard training and isn't inherently harmful. What matters is whether your training volume is appropriate for your recovery capacity — not whether you crossed the 60-minute line.
Diminishing returns are real. Training sessions do have a practical ceiling. Once you've accumulated enough volume (typically 10–20 hard sets for a given muscle group), additional sets in the same session produce less stimulus and more fatigue. More time doesn't mean more gains.
How Long Most Sessions Should Be
Here's a reasonable framework based on common training goals:
Strength training (3–5 days/week)
45–75 minutes per session, not including warm-up.
This is enough time to complete 15–25 working sets across 5–8 exercises with 2–4 minute rest periods between heavy compound sets. If you're consistently going much longer, you're either doing too much volume in one session, resting too long, or not focused.
Full body workouts (3 days/week)
50–80 minutes.
Full body sessions involve more exercises and more compound movements than splits. Slightly longer is expected — but if you're consistently hitting 90+ minutes three times a week, consider whether your volume is distributed too heavily in single sessions.
Push/pull/legs (6 days/week)
40–60 minutes per session.
PPL splits divide volume across more sessions, so individual sessions are shorter. If you're training six days a week and each session takes 90 minutes, your weekly volume is almost certainly too high.
Cardio and conditioning
20–45 minutes for most people.
More is not better with conditioning if your primary goal is muscle retention. 20–30 minutes of moderate cardio 2–3 times per week is enough to support cardiovascular health without interfering with recovery.
What's Actually Eating Your Time
If your sessions are consistently longer than they should be, the culprit is usually one of these:
Rest periods that are too long. Rest 2–3 minutes between heavy compound sets (squat, deadlift, bench, row). For isolation work, 60–90 seconds is typically enough. Scrolling Instagram for 5 minutes between sets is a productivity issue disguised as a training choice.
Too many exercises. A well-designed session doesn't need 12 different movements. For a push day, you might do 3–4 exercises total. More isn't better — it just takes longer.
Unfocused warm-up. Warm-up matters. But 30 minutes of foam rolling and stretching before a session isn't warming up — it's procrastinating. 5–10 minutes of dynamic movement and a few ramp-up sets for your first lift is enough.
No plan. If you're improvising your session at the gym, you'll take longer to make worse decisions. Going in with a plan — even a rough one — dramatically speeds up your sessions.
Shorter Isn't Always Better
None of this means you should rush. There's a version of the "keep it under an hour" advice that leads people to cut rest periods too short, skip warm-ups, and leave sets in the tank to finish faster.
That's not efficiency — it's just doing less work.
Heavy compound movements need adequate rest to be performed safely and with full effort. If you're squatting 4 sets of 5 near your max, 90 seconds of rest is not enough. Take 3–4 minutes. The session gets longer. That's fine.
The goal is *productive* time, not *short* time.
Signs Your Workouts Are Too Long
You're spending too long in the gym if:
- You're consistently there for 2+ hours on split sessions
- Your performance degrades significantly by the end (you can't complete planned sets)
- You leave feeling crushed rather than challenged
- Your week-to-week fatigue is accumulating without deload
- You're not progressing despite the volume
More volume doesn't help if your body can't recover from it.
Signs Your Workouts Are Too Short
You're probably under-training if:
- You're done in 25–30 minutes on a full strength session
- You're skipping compound movements because "you don't have time"
- You're not reaching RPE 7–9 on any sets
- Progress has stalled and you haven't changed anything
If you're consistently pressed for time, the fix isn't just shorter rest periods — it may be restructuring your split or choosing a programme designed for the time you actually have.
The Real Variable: Weekly Volume
Individual session length matters less than your weekly training volume. Whether you do 16 sets for legs in one 90-minute session or split them across two 45-minute sessions, the stimulus is similar.
Research consistently supports 10–20 hard sets per muscle group per week as the working range for hypertrophy, with beginners at the lower end and advanced lifters toward the upper end. Session length is just how you distribute that volume.
More total sessions = shorter individual sessions. Fewer sessions = longer individual sessions. Neither is objectively better — the best approach is the one that fits your schedule and you'll actually do consistently.
How Soma Helps
Soma's AI workout plans are designed around the volume targets that actually drive results — not arbitrary time limits. When the AI builds your programme, it distributes sets across sessions based on your split, your experience level, and your recovery capacity.
The built-in rest timer keeps your sessions moving. RPE tracking after each set helps the AI assess whether you're working hard enough or pushing too far. And the AI coach can answer directly: "Are my sessions the right length?" based on your actual training data — not generic advice.
When you pair training structure with Soma's nutrition tracking, you get a clearer picture of why sessions feel hard or easy. Under-eating on training days has a direct effect on performance and recovery — and that context lives in the same app as your workouts.
Download Soma free on the App Store and train smarter, not longer.