Originally Posted by dudefella
Pushups are going to build more endurance than strength. Since you're looking for strength and mass, all pushups are really going to do is fatigue your muscles. Probably make you increase your strength a bit slower. You did say you want to put on something like 15lb... that won't happen if you're not eating enough, and are over-training certain muscle groups (pushups on off days... over-training your pecs, delts and triceps).
You want to build up your strength, keep it low reps, high weight. Aim for 5 reps on your last set. If you can do that without a spot helping you on hte last couple reps, raise the weight. Compound lifts, you can probably move up 5lb or so every week, assuming your diet is in check, and (probably more importantly) you're getting enough rest. This includes BOTH sleep and letting your muscles recover properly (no fucking pushups unless you're doing them during a workout!).
Thanks for the tips, yeah the sleep maybe a factor, I only get around 5-6 hours per day, 7 if I am lucky. What is an ideal amount of hours of sleep I shuold try to get?