there is no quick fix for gaining muscle....sorry.

doing 1000 sit ups wont give you a six pack, being able to do 100 push ups/chins wont give you big muscles. All it will do is create muscular endurance... sure you will see some size from it but nothing special.

gaining muscle takes time and its prefered that all weight change (as muscle weighs more than fat) is slow as the heart has to adapt to this weight increase. You wouldnt ask a 1 litre engine to suddenly move a bus now would you?

for muscle you need:
spot on nutrition - we all have a six pack, its just covered with a layer of fat
good training ethic - endless pushups/chins/crunches wont cut it
adequate sleep - you grow when you rest, not when you train