Although it’s the Christmas season, the title is not Shopping for Strong Bones. It is actual hopping, of the jumping-up-and-down variety. With or without a mini-trampoline (great fun, by the way, and readily available online).

Exercise researchers are spending more time these days determining which forms of exercise actually produce specific health benefits. Several weeks ago I wrote about the findings that exercise didn’t help with weight loss unless you cut calories, too.