Don’t let rising temps keep you from moving. Instead, simply relocate your exercise regimen to someplace cool: the pool.
A 30-minute swim will get your heart rate up without wearing you down.
Working out in water makes for safe and effective summertime cardio; it greatly reduces the risk of heat-related injuries that stem from dehydration and exhaustion.
Vary your swim strokes every 5-10 laps to work as many muscle groups as you can in a single session.