The effectiveness of strength training is really down to the extent that you are genuinely challenging your muscles, not the duration of ST. It's quality not quantity that matters with ST.
When first starting out, using a light weight and focussing on the correct form is a good idea, after a couple of goes through you should increase the weight and really aim to fatigue the muscles in 12 reps or less with every set. Lifting heavy is far more effective ST than more time spent with lighter weights.
ST works by creating microscopic tears in the muscle fibers, which then grow back stronger, but this takes time. Most experts recommend resting at least 48 hours between ST sessions. While the bulk of the repair will happen within 48 hours, the repair process will continue at least 72 hours. Doing ST more frequently will trigger this process more often, but waiting longer will mean you get more out of each ST session. So while there is a definite advantage in going from 1 to 2 ST sessions per week, I'm not sure the advantage in going from 2 to 3 is as large.
Also, ST 3 times per week will give you 2 breaks of 48 hours, and one of 72, which will give you a fuller recovery.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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