If you can complete 15 reps easily, it's probably time to increase the resistance so that you get the full benefits of resistance training. Increase the weight until you're able to do just 5-10 repetitions, and you'll find you acquire more muscular mass. We're trying to make the muscles function optimally and reap the associated health benefits. Resistance exercise is part of an overall fitness plan, and not the complete blueprint. One notable exception to the 12-15 rep guideline are situps and other waist exercises.
High repetitions are fairly standard here.
Denzel Washington knocked out as many as 1000 stomach crunches daily for months to achieve the washboard abs he displayed in The Hurricane. I work out with weights two times a week, for about 30 minutes each session. And maybe to watch exercise videos instead of old Godzilla reruns. Using the Internet to meet someone online is a very convenient, effective and enjoyable experience. More than 50,000 people a day become members of these fast growing online clubs.