You can knock out a five-mile run, easy. So why does swimming as a workout for 15 minutes leave you heaving? Because it’s damned hard.

When it comes to physical fitness, we have no shortage of options to choose from. Whether one chooses great cardio exercises such as running, jogging or jumping rope; or resistance training ...

This article was medically reviewed by Joey Thurman, CSCS, CPT, FNS, a Chicago-based fitness expert and creator of Fast Results program. Both running and swimming are good forms of cardiovascular ...