A typical interval workout
A typical interval workout might take place at a running track and:
-Start with a 5-minute warm-up jog
-Followed by a 30-second sprint
-With a 60-second walk back to the starting line
Repeat 5 times and back it up with a 5-minute jog to cool down and you have an effective and efficient session, taking up less than 20 minutes of your time.
Interval training is also commonly performed on a bike, treadmill, cross-trainer, skipping-rope ... anything that allows you to get your heart rate up.
Sounds easy, right?