On calf raises- it's something easy to learn and do that keeps the person moving, and thus burning calories. Edit: they're also much easier on the knees than a veritcal jump, and less horrific for a beginner. I think jumping squats are fun, but I'm in the minority, as even most fit people are flat out terrified of them.
I'm also a big believer in training and strengthening every muscle group whether someone sees an immediate point or not. If I work with a 18 yr old guy whos only concern is to be the strongest bench presser in the world, he's going to be doing plenty of squats, deadlifts, and even rear delt lateral raises as well, as any muscle imbalance in the body is likely to cause problems- of course this is well beyond the scope of my article, but you get the idea
