I should probably clarify something...by "started lifting heavy" I meant that I started lifting weights, as opposed to bodyweight exercises like push-ups and pull-ups. I have a power tower at home and had been doing some push-ups, dips, and (attempted) pull-ups. Anyways, just got back from the gym today and I went with lower weights while trying to focus on form. On the bench I started with the bar plus 20 pounds, which I feel was a good amount. I got through 4 sets before failing on the 5th.