Give each muscle roughly 48 hours before training it hard again, which usually means one to two days between sessions.
A trained muscle needs about 48 hours to recover before you hammer it again, so training a muscle twice a week with rest days between works well. You can train daily as long as you rotate body parts, for example upper one day and lower the next. Full rest days matter too, and most people do best with at least one or two per week for joints, sleep, and the nervous system.
Protein synthesis and repair for a worked muscle run high for roughly a day or two after a hard session. That is why splits pair a muscle with 48 hours before its next hard session, letting you keep training other areas in between.
Heavy squats and deadlifts tax your whole body and central nervous system, not just the target muscle. After a brutal leg or deadlift day, take a full day off or do something light before another demanding session.
The heavier and closer to failure you train, the more recovery you need. If soreness lingers past 48 to 72 hours or your lifts drop, you are under-recovered and should add a rest day or cut volume slightly.
Give each muscle roughly 48 hours before training it hard again, which usually means one to two days between sessions.
