Just as you would never be able to sprint for a full mile, a bodybuilder who is performing 20-30 sets for each muscle … muscle soreness that lingers; ... and how long and how often to work out. Spoiler alert: it varies from person to person. When that 48 hours is up, the muscle is no longer growing, unless you train it again. Also, before we get started, these are workouts … ... A 30-minute cardio workout is a safe activity for most people to do every day. How often do bodybuilders workout, some might ask? However, people who have chronic … I agree I used to do what lee priest does 6 days a week, cardio 1 hour in the morning 1 1/2 hour workout … What pro bodybuilders do and what the rest of us should do are sometimes completely different things. After lifting, a 'window' opens for muscle growth, which lasts approximately 48 hours. Mentzer explained that you can train long or hard but you can’t do both at the same time. According to a 2016 Sports Medicine review, even if you don't work that muscle any harder or longer, by simply dividing your chest, leg or back workout into two days, you'll spur more muscle … He used the analogy of a runner. Here are the workouts of 5 LEGENDARY BODYBUILDERS and how much time it may have taken them to get through them.