In order to come up with an effective method of interval training, Katie Costalas and Charbel Sarkis have spent almost two or more years.

Katie Costalas and Charbel Sarkis have spent about two years developing an effective format of interval training on the world's leading Woodaway treadmills and strength equipment at the Gym Philadelphia.

Fitness classes Philadelphia is not your ordinary gym, but an ultimate workout station that is furnished with the latest industry leading treadmills and a variety of strength equipment to offer you better results within no time.