Body weight exercises
Learning Center
Ankylosing spondylitis
Learn about this inflammatory disease that can cause some of the vertebrae in the spine to fuse over time.
Video: Step-up exercise
The step-up is an exercise for the legs and buttocks. See how it's done.
Video: Lunge exercise
The lunge is an exercise that targets the leg muscles. See how it's done.
Video: Squat exercise
The squat is an exercise that targets the leg muscles. See how it's done.
Video: Abdominal crunch
The abdominal crunch is a classic core-strength exercise. See how it's done.
Video: Modified pushup
The modified pushup is less challenging than a classic pushup. See how it's done.
Multiple sclerosis
This nervous system disorder causes a range of symptoms — and while there's no cure, it's possible to have long periods of remission.
Different types of COVID-19 vaccines: How they work
Find out how different COVID-19 vaccines cause your body to create antibodies that will fight the COVID-19 virus.