Grease the groove! If you haven't heard of it, google it. I've used this technique myself to build up my pushups and situps and it works. A little work done over and over again every day can work wonders.
Current PRs at 242, raw w/ wraps- 525, 355, 605, 1485
Roboro tui, perimo vester adversarius
(Build yourself, destroy your enemy)