IMAGINE FURIOUSLY cranking your pedals in a dark, sweaty spin studio and hearing the instructor command you to ramp your resistance up one full turn. Do you do it, or cheat a little to avoid the burn? Consider a strength training move that calls for a “heavy” set of dumbbells. It’s difficult to motivate yourself to push past your limits, especially when no one’s watching. But an assertive new breed of fitness devices uses artificial intelligence to take that decision out of...

Source: Wall Street Journal May 12, 2020 18:45 UTC