Thanks I will read it!
Does that mean I only really need to rest when my muscles are sore or I struggle to work out?
Yes. Remember, you're breaking your muscle fibres down with resistance training. For arguments sake, let's say your biceps consisted of 10 fibres each, you train them and break down a lot of those fibres. They grow back during your rest period and increase to 12 fibres instead of 10 to be stronger for next time. If you keep breaking them down without giving them a rest of recuperate, you're wasting your time.
I'm a big fan of HIT (high intensity training). I'm literally in and out of the gym in 30min, That include warming up exercises too. I do about 2 sets at max weight for any muscles group. For example shoulder training.
Shoulder Presses.
12 reps at 50% of max weight (warm up)
8 reps at 75 % of max weight (warm up)
6 reps at 100% of max weight (working set)
100% of max weight to failure with 2 negatives. (working set)
100% max weight dumbbell side raises to failure with 2 negatives.
I'm done with shoulders.
Sounds like your starting out. I recommend training 2 days a week, hitting your whole body in those two sessions. Pick any 2 days and make sure they're as far apart as possible. If you hit yourself hard enough, then 2 days a week will be plenty. Take another two days and do light cardio to keep fat levels under control. Obviously getting your diet right is a given, or you're wasting your time trying. Some say 2 days a week is too little. Always reminds me of what a natural bodybuilder told me once. 'I trained 5 days a week and made good gains. I moved to 4 day weeks and made even more. Then I moved to 3 day weeks and made yet more'.
Less is more with bodybuilding imo. Just make sure you do it with massive intensity.