(Image credit: Shutterstock) There are more exercises named after animals than you might imagine. A quick online search turned up the likes of the frog stretch , the inchworm , the bear crawl, and the duck walk. I’ve tested the first two for Tom’s Guide, but I’ve never heard of the second, and the only duck walk I’m familiar with is Chuck Berry’s (though I have to assume ducks are pretty good at it, too). All the moves look faintly ridiculous and, so, I suppose, does the donkey kick, which is the animal-inspired exercise most people will be familiar with. But while it’s not the most elegant-looking move, it’s a powerhouse glute exercise. It is also known as the quadruped bent-knee hip extension, which explains why people prefer to call it ‘the donkey kick.’ What does it do? It primarily targets the gluteus maximus, the largest of the gluteal muscles and the body's single biggest muscle. The move also works the gluteus medius and, to a lesser extent, the hip flexors.…