Perform optimum reps

I like to train heavy, but I also like to use lots of reps. I recently performed incline barbell curls with 405 pounds for 10 reps, but I consider that to be medium to light weight, and, therefore, not mass training. My favorite number of mass reps on a regular basis is 10, to failure, of course. However, that doesn't mean you should avoid going as heavy as possible now and then.