Do any of you guys do power cleans?
From my experience, they are really good for gaining mass and strength over a short period of time. The reason is it incorporates so many muscles in a concentrated exploision of force. Unlike other benching, squatting, etc, power-cleaning has an explosive and aerobic element to it that really pushes your body to the limit.
And once you get the hang of it, you can raise your power-cleaning weight quite easily. I made 20lb increments in between power-cleaning days.