If you've been running for miles on the treadmill at a steady pace, you may want to mix it up with some high-intensity interval training, or HIIT.
"You'll see more progress and faster results with 20 minutes of this kind of training compared to jogging on a treadmill for an hour or doing hundreds of crunches," certified personal trainer Kendall Janicola, NCSF and instructor at Fhitting Room in New York City, told POPSUGAR. "It's quick, builds lean muscle, which helps your body burn fat, makes you strong, and is a lot more fun than sitting on a machine for hours!" She also credits the afterburn effect, or EPOC, in which your body burns calories after the workout is over.
You can implement HIIT with plyometrics, weight-training circuits, or cardio in the form of sprints.
