When cycling, you should aim to keep your speed around 80 to 110 rpm. This will allow you to ride farther with less knee strain and fatigue. To calculate your speed, you should count the number of times your right leg goes to the top of the pedal stroke in ten seconds. Once you calculate this number, multiply by six. This gives you your pedal rpms.
To stick with your workout routine, find a fitness friend. People who are trying to lose weight have much more success if they have a workout buddy. Knowing that someone is counting on you to be at the gym or outside for your morning run keeps you from skipping out on your sweat sessions.