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umm... all of them, which is why you develope a routine over time to gauge your limitations and strengths for a variety of different types of exercises and movements. this will lead you to precisely predict which weight you should be using (i use the pyramid system). typically you'll get very vrey close to complete failure at the 2nd-3rd set, which is why the pyramid system is so great because you will then need to add a little more weight which will get you to complete failure by the 4th or 5th set, which should be the end of your exercise. supersetting alters the results, since you'll fail much faster. and if you've read my routine thread (which has changed a lot already) you'll see that i like to get a feeling of all-out failure at the end of my workout, no matter how tired i feel, my partner assures that i get to whatever machine or bench in order to get them done. i can only workout a certain muscle group every 4 days so i need to take full advantage of the days when i am scheduled to work them out.
if you're not putting in the max output in every set, every rep. why even bother?
oh, and im rarely on AIM anymore because im rarely home anymore. work and school. and im leaving for 3 weeks on sunday night to the carribean and latin america for a scuba/snorkeling vacation trip, so you'll see even less of me.
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