Re: Alternating Routines?
Altering your routine can be any one of a number of things to keep your body from adapting to what you are doing. If you do the same thing every day, your body soon adapts to that stress, you stop progressing and unless pushed, your body will only do what is necessary to get by.
You can vary your routine in any number of ways, including:
changing the exercises
changing from free weights to machine or vice versa
changing the rep range
changing the exercise order
increasing the weights being lifted
changing your exercise days/habits.
Overall body exercise days are good for fitness and/or beginners but of you are looking at seriously increasing strength or size you will have to look at breaking it up. Your muscles need to be given time to build and this happens during rest. So you can either do an overall body routine every 2nd or 3rd day, or split your exercises into two or more separate routines, doing them on alternate days.
For size I suggest the 8-12 rep range, 3 or 4 sets per exercise, starting with 2 exercises per body part. This brings up the previous point about splitting up your routine so that each session doesn't take 2 hours.
My split routines are chest, shoulders, triceps, upper abs in one session, legs and lower abs in another, back, biceps and upper abs in the third. Chest exercises tend to utilise the triceps, back exercises tend to also work the biceps, which is why I put them together. There is no real right or wrong grouping, you can find what works for you.