Rev Up Your Cardio with Pyramids!

Getting bored on the treadmill, bike or elliptical? Do some pyramids to make the time pass quicker and also to challenge your cardio fitness.
If you are on a piece of cardio equipment, try this challenge:
 
15 seconds race/fast pace
15 seconds slower pace
30 seconds race/fast pace
15 seconds slower pace
45 seconds race/fast pace
15 seconds slower pace
60 seconds race/fast pace
15 seconds slower pace
45 seconds race/fast pace
15 seconds slower pace
30 seconds race/fast pace
15 seconds slower pace
 
Then finish out your workout the way you normally would. The next time, do two rounds of pyramids, then three... See how many you can do and watch your fitness level soar!