I think it depends on your own recovery periods.
For most of us... I think 3 times a week has got to be rubbish.
Here's my logic:
1) When I started lifting I was sore for 2weeks. (Do beginners really recover faster?)
2) Adults take a while to hit peak muscle soreness after a workout. For myself it
has always taken 36-48 hours. Allowing a similar period for recovery and
rebuilding/growth implies that I need 4 days between workouts for each
body part.
Ok. Logic isn't necessarily reality. For example, the exercises that my physio gives me (twice a day.. high volume) also seem to build muscle rather well. And in science - nature is often contrary to expectations.
So my thought is... if you are aiming for strength, if you enjoy training, if you understand the muscle groups, and you have time to go to the gym more often, then I'd go with a two way split, right from the start.
Quite simply... at no point in my life did I truly recover fast enough for 3 times/week unless I severly limited my lifting in each session.
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