Progressive Set - Bicep Curls!

Here's how to do a progressive set: pick a set of light weights and do 15 reps, right away pick up medium weights and do 12 reps then finally heavy weights for 8 reps.  Rest for about 90 seconds and then do it in reverse: heavy weights for 8 reps, medium weights for 12 reps, light weights for 15 reps - no rest in between these.  The only rest you get is the 90 seconds before you do your heavy to light set.  Feel free to leave a comment :)