My 8-year-old daughter, Arlie — with all the gusto of a squirrel that’s just snorted a Pixie Stick — asked if I was interested in seeing her do a pushup. “I’m really good at them,” she said, ...

The classic pushup is a tried-and-true bodyweight exercise that strengthens your upper body and enhances your stability. The saying “get down and give me 20” is well-known for a reason because the ...