Selene Yeager takes you through an interval cycling workout called 3-2-1 for hill surges. The format of the workout is to do repeated hard short bursts with increasing intensity. This type of workout will help when you're biking up hills or trying to overcome your limits.
Spinning, or indoor cycling, is a form of aerobic exercise that uses a stationary bike. It can be done individually or in a class. Learn how to spin in this exercise tutorial. When spinning you should keep feet tight in stirrups, use three sitting positions, keep knees safe, adjust the height and keep feet flat, thighs engaged. With this how to video you will be able to spin for a more effective workout.