I love this workout when I'm short on time and I want to get a quick hard core Cardio workout in!
My Clients love this one they think it's going to be easy because it's only 20 minutes but they are dripping with sweat by the time it's over!
You can modify the pace(Mph) to make it work for you.
Slower for beginners and faster for the more advanced exerciser.
ENJOY YOUR WORKOUT!