the repetition.
Here's a good place to start reading:
http://www.trygve.com/mfw_faq.html
least 45 to 60 minutes each day. point where I am comfortable with most of the machines and exercises in the gym. 'perform to failure' kind of stress.
Good start.
(I can spend maximum of 1 hour at the gym).
Depending on how you've arranged your workout, a baseline might be something like:
Legs: a couple of compound exercises, ideally involving knee extension and/or hip extension (squats, deadlifts, stiff legged deadlifts, stepups, etc.), though you could also include a knee flexion exercise (hamstring curl) Back: 1 exercise pulling down, 1 exercise pulling horizontally, 1 exercise pulling up Chest: 1 exercise pressing away from your body Shoulders: 1 exercise pressing up Arms: you could assume they get work in back, chest, and shoulder work, or you could add 1 exercise for biceps and triceps Supporting muscles of torso (abs, obliques, lower back): you can assume they get work from the compound stuff or you can add 1 exercise for abs Calves: 1 exercise, ideally straight legged
Now, you can put this together in a variety of ways:
-All together in one workout like this:
http://www.hypertrophy-specific.com/hst_index.html -Upper-lower body split -Push-pull legs split, etc.
As a beginner, the 12-15 range is fine. For some exercises which are very demanding, you might pick a weight you would use for 12-15 reps, but do more sets with fewer reps (e.g. 5 sets x 8 reps) so that your technique doesn't degrade as you are learning.
In a few months, experiment with increasing weight and lowering reps to around 8-12.
seconds - that seems too little for me and I enerally feel good to do next set when I pause
That's fine.
vice-versa, i.e first lower body and then upper body) workouts?
The only imperative is that there are no imperatives.
Can I alternate
Sure, if you want. One good guideline is not to fatigue stabilizing muscles too early. So, don't do lower back before squats, for example. Or you may find that doing triceps before bench press doesn't work well (though some people purposely do it). Other than that, arrange as you like.
I am now comfortable with these, is it okay if I don't add variety?
It's okay, but you might find that rotating exercises from day to day helps prevent overuse injuries. Perhaps select 1 exercise from each category above to do in the workout.
I don't see any squatting-type exercises here, which would be useful for a runner.
I'd add a rowing movement to the upper body.