At the gym, Ethan stood in front of a room full of exercise equipment, feeling completely lost. He didn’t want to move at all.

“Let’s start with a warm-up,” Cara led him to the elliptical machine.

Ethan had no choice but to follow. He started by pedaling for a while, then moved to the treadmill for a light jog, and finally went to the rowing machine for a few pulls.

“Now, let’s get into the real workout.”

Cara had him lie down ...