I only rest 30 seconds in between my sets. Is this counter productive? I'm mainly going for muscle mass. I've also read that Ron Coleman (not Ronnie Coleman) only rested 30 seconds in between sets. Same as Serge Nubret. But, I usually lift til failure or one rep short til failure. I'm in and out of the gym in around 30-45 minutes. I'm def. sweating way more than anyone else in there since the rest periods are short and I'm super pumped.
My current Chest/Tricep workout.
4 x 8-12 Incline DB Bench
3 x 8-12 Flat BB Bench
3 x 8-15 Incline DB Fly's
3 x 8-12 Weighted Dips
3 x 8-15 Close Grip Bench
3 x 8-15 Rope Pushdowns
All 30 seconds rest inbetween sets and 1 minute rest inbetween exercises, or just enough time to switch to the next one and get the weight ready.