Need some exercise motivation for the hot months ahead? Researchers at the University of Georgia found that workplace programs that had employees set time-specific exercise goals got twice as many people to work out for 30 minutes five times a week (for six weeks!) as the control groups did.

During the second six weeks of the study, the goal-setting group increased workout times even more.

Lesson learned: Set goals for yourself for an easy workout boost. Add 5 minutes onto your workout time, up your intensity one level on the cardio machines, or lift 5 to 10% heavier weight. For even more motivation, work out in a group.