When I first started lifting, I did circuits... Probably because I learned from friends who had taken our schools weights class, where the teacher had to shuttle kids through a workout as quickly as possible.
I transitioned to bodybuilding style lifting a few years later, after I started reading forums, etc. and learning from guys at college. I always preferred high rep sets -- I felt like they got my heart pounding and pump going. However, i worried about lifting too light.
On the other hand, I never liked low rep sets. I hated waiting around for my 'muscles to recover' even though I wasn't tired. Its true, if I waited long enough I'd get more reps, but I almost never felt tired for more than a few seconds after a set.
I like supersets, but I still found myself waiting around too much. Yesterday, I decided to try doing circuits of 3-4 exercises with heavy weight (5-8 reps), no rest between sets.
It was great -- heart pounding, stayed warm, felt the muscle fatigue in a reasonable number of reps, got in and out of the gym fast. I feel I might just be suited to this type of lifting. I rarely feel like Im capable of doing a set that requires minutes to recover from.
What about you guys? Anyone else feel the same way?