In its simplest form, strength means utilizing muscle to generate force. And if you are interested in living a long and healthy life and playing with your great-grandkids someday, then muscle mass should be a priority.

Resistance bands aren’t just for rehab—they’re a legit tool for building muscle, especially for women over 45.

Peter Attia, MD, is the founder of Early Medical, a medical practice that applies the principles of Medicine 3.0 to patients with the goal of simultaneously lengthening their lifespan and increasing their healthspan. He is the host of The Peter...