Quick treadmill interval workout to torch calories and increase speed!

Okay, I have been seriously struggling with cardio and running. I’d like to increase my endurance and start running some races this spring so I decided to get back on the wagon. (Losing some belly fat would be nice too, just saying) Two years ago my intervals were 6.0 and 8.0. Well, that didn’t really work for this chick today (I almost died). I changed it to 5.5 and 7.5 so I could actually recover and finish. Here is the workout, it seriously had me breathing hard and dripping in sweat. Best part, it was only 15 minutes!