There is a great discussion in the fitness and health world about whether or not interval training is TRULY the most effective. Personally, I have found it to bring great results and something about it always makes me feel better and more accomplished than spending 45mins on an elliptical or treadmill. Check out this article from the Mayo Clinic about interval training and then try this cardio set! This format can also be used on any piece of cardio equipment- simply modify the speeds/resistances and inclines for the desired effect.
Feel free to adjust here and there to push yourself harder! Let me know what you think!!!
Have a GREAT week and happy summer!
Train hard. Eat clean. Live happy.