Electro-magnetic resistance exercise bikes bring diversity and intensity to your workout routine. Unlike manually adjusted resistance bikes . electromagnetic resistance changes resistance levels smoothly at the press of a button or according to a user-selected exercise program. Combined with a 300 lb max weight capacity . this adjustable exercise machine could be customized to fit nearly any user. The Sunny Health & Fitness Evo-Fit Exercise Bike is the next evolution in helping you reach your fitness goals.