He revealed that high-intensity interval training (HIIT) on a treadmill and indoor rowing at high intensity are the ones to steer clear of. HIIT workouts elevate heart rates quickly and intensely.

In other words, a two-mile run doesn't perfectly translate to two miles worth of work on the bike or rowing machine ... If you don’t have an indoor cardio machine to use, or can't access a gym, you ...

Here's a list of the best indoor rowing machines ... and build strength. Rowing machines are great for both HIIT workouts and low-intensity exercise, and they can work for a wide range of ages ...