"I wouldn't base an entire exercise program off of running alone," said Jared. If you enjoy running, he suggested to aim for one to three 20- 30-minute runs per week.
Krissi added that if you're doing a variety of activities like running, lifting weights, yoga, and other fitness classes, then it has to fall into place with the rest of your activity so you don't over-train. "Overtraining is the fastest way to injury and inactivity, which doesn't support your goals," she said.
Overdoing it can also make you ravenous, warned Rachel, so make sure you're not running so much that increased hunger leads to overeating, which can actually cause weight gain. "Performing HIIT workouts with your running such as sprints or walk/runs can burn more calories over the next several hours, and also has been shown to blunt hunger.