Many people put in miles on the treadmill, thinking it's the key to weight loss.
But that's not always the case.
Former professional football player and now fitness guru Brendon Ayanbadejo says you have to switch up your running routine.
That means add some hills, intervals, and even switch up the speed.
If not, you could be burning a lot of energy with no payoff.
Brendon says healthy eating and resistance training combined with running is key.
Brendon says if you go above 84 percent of your max heart rate in your workout, you're going to continue to burn fat for the future.