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If you're in a hurry, you can do what newageredneck suggests, but keep in mind that no muscle group is isolated. You're not going to be able to really max out your triceps right after maxing your biceps.
Being aware of this, I vary which exercise I do first. EG: Some workouts I'll start with biceps, followed by triceps, and other times I'll start with triceps, followed by biceps. For my arms, the weights I use when exercising a body part first in the sequence are just 5 lbs heavier than when I exercise the same body part 2nd in the sequence. That tells me I'm resting just long enough to work the 2nd bodypart in the sequence almost as intensely as I work it when it is first in the sequence. The difference is minimal!
For power (to be able to lift more weight): rest until your muscles have mostly recovered from the exercise - about one to two minutes. This is mostly done explosively for fewer reps than traditional body building.
For strength and muscle size: rest only until your heart rate gets back down and your muscles have had minimal time to recover - about 45 seconds to a minute. The idea is to recruit more muscle tissue to help you lift the same weight (and break more muscle tissue down). The "I go - you go" method is sometimes a little too long.
For cardiovascular and muscular endurance: string several exercises into a circuit and jump immediately from one to the other - like the CrossFit method. This is what I am doing now, and the results are pretty good. The whole workout takes about 15-20 minutes, and I am close to puking every time. Intensity is the key here.
To get into better shape and stay in shape. I'm 53 y/o and trying to delay Father Time.
That's an intent, not a goal. A goal would be, lose 15 lbs in 12 months. Run a 10K in 60 minutes or less.
That said, Since it sounds like you don't want to go for raw strength but would prefer more of a "fitness" approach. Why take a rest. You can knock out a great circuit in 15 - 20 minutes that will wear you out and shape you up fast.
Ignore all the "really hit your bis and tris" silliness unless you want to get some guns. Right now, focus on getting used to the weights and the work. Keep your rest short and keep moving. Circuits and Supersets will get you taken care of.
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