Group fitness has entered its strength era.

Lack of regular physical exercise is recognized by the American Heart Association as one of the key heart disease risk factors, and it is assumed that cardio exercise (walking, jogging, swimming, etc.

Here’s what to know about the health benefits of both forms of exercise. Ask Well Here’s what to know about the health benefits of both forms of exercise. Credit...Eric Helgas for The New York Times ...

Top exercise scientist Dr. Inigo San Millan made zone 2 cardio famous. Here's what the science actually says it does for your ...

Your heart works tirelessly every second of every day, pumping blood throughout your body and supplying oxygen and nutrients ...

Online and on social media, fitness advice is everywhere with a mix of workout recommendations — some influencers glorify strength exercises like squats and bench presses for building muscle growth ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. So where should you ...