You don’t have to be a gym bro to get strong. Three ex-Tesla engineers made a beautiful bar velocity tracker for every kind of weight lifter. Strength training is the new cardio. In the 1990s, everyone sweated in spin classes; in the 2000s, James Park at Fitbit turned us all into step-counting Tamagotchis. Now we’re all weight lifters. In its year-in-review data, Garmin reported that this ... [5822 chars]