Common questions
Is 3 days a week enough to build muscle?
Yes, provided each muscle gets trained about twice a week and you are progressively adding load. Three full-body sessions covers every major muscle group twice over 8-9 days, which is why a 3-day split is usually structured full-body rather than as a bro split. More days is not automatically better, it mainly buys you shorter sessions and more room for isolation work.
Push/pull/legs or upper/lower, which should I pick?
It mostly comes down to how many days you can train. Upper/lower fits 4 days cleanly and hits each muscle twice a week. Push/pull/legs fits 6 days at twice a week, or 3 days at once a week, which is on the low side for growth. If you train 3 or 4 days, upper/lower or full-body will usually beat PPL. At 5-6 days, PPL makes more sense.
How do I know when to add weight?
Use double progression. Pick a rep range, say 8-10. When you hit the top of that range for every set with clean form, add the smallest available increment next session and expect to drop back toward the bottom of the range. That gives you an objective trigger rather than guessing, and it works at any experience level.
How long should each session take?
Most well-built sessions land between 45 and 75 minutes, including warm-up. If you are running much longer, the usual cause is rest periods drifting rather than too much work. Compounds need 2-3 minutes between sets; isolation work needs 60-90 seconds. Under 45 minutes is workable if you superset accessories and keep the exercise count tight.
What happens if I miss a session?
Do not try to make it up by cramming two sessions together or adding it to the end of the week. Pick the split back up where you left off and shift everything forward a day. Missing one session in a week has almost no effect on progress over a training block; the thing that actually stalls people is abandoning the plan after missing one.