Also, just to clarify, high resistance, low reps will build strength, BUT it's not strength you're after. To do lots of sit-ups/push-ups in a certain time frame you need muscular endurance. Therefore, do lots of push ups and sit ups. The more you do, assuming that you keep adding on, the more you will be able to do.
Basic rule:
High resistance, low reps = muscular strength.
Low resistance, high reps = muscular endurance.
The program that IF is talking about is awesome as far as I know (never used it, but heard lots of positive reports), but just bear in mind the basic rule above.
"i can barely click the link. but i way why stop drinking .... i got ... moe .. fcke me ..im out of it" - GDA on Traditional vs Modern Wushu
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but what if the man of steel hasta fight another man of steel only that man of steel knows kung fu? - Kristoffer
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How do you think monks/strippers got started before the internet? - Gene Ching
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Find your peace in practice. - Gene Ching