honestly, if your primary goal at this point is to build muscle and gain weight - you'll be shooting yourself in the foot with your proposed workout schedule. i believe it was mentioned earlier - ONE GOAL AT A TIME. all that cardio is gonna burn up all the food you're putting in as opposed to having it go towards lean muscle -unless you plan on putting down about 4k calories/day (which is an insane amount of food unless you're going to mcdonald's for every meal).
as far as what muscle groups to work together/separate you need to consider this: when you work your chest, you use your triceps and shoulders as well. when you work your back, you use your biceps. also, i would recc. free weights vs. machines if you understand the exercises and maintain proper form.
try this for 3 wks: moderate weight (10-12 reps)
mon - chest/back
wed - shoulders, biceps, triceps
fri - legs/back
then do this for the next 3 wks: moderate weight (10-12 reps)
mon - chest/shoulders/triceps
wed - back/biceps
fri - legs/back
final 3wks
repeat round 1 - go heavier (8-10 reps)
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