if i do100 sit up crunches per day for 5 times a week, how long will it take 4 the fruits of my labor to show?

Depends on your current body type, your diet and your metabolism. If you're fat, crunches alone will not fix your problem, you have to diet and exercise (aerobically) as well. That said if everything else is right, I'd bet you'd see some results in 6 - 8 weeks. Now go to the gym heffer.

Totally depends on your diet. Crunches help, but the main thing is dieting. Abs are made In the kitchen, not the gym. Don't over do crunches, it may actually add inches to your waist without thinning the layer of flab 1st by dieting. Hope this helps.

If your doing them correctly and doing various types of crunches you'll see results in about 6-12 weeks. I saw great results in less than two months doing only 50 per day. But you have to make sure your following proper technique.

AS someone else said... Depends... I would add some other exercises into your daily life as well. Crunches can take anywhere from a week to a month to start showing results. Most of the time it is the latter, and can even take longer. Good luck!

That's good that you are not in rush. It's good if you don't get stuck up in the mathematical mess of calories. Eat right, stay fit. Do not compete with others.Why set a goal ? Exercise is a life time activity.Do not be too figure conscious. A good mind set is also a major requirement of a pleasing personality. Best of Luck !!!

depends if your fruits are hidden beneath a keg.