* Here’s a new cross-training idea: shivering in the cold. Okay, it’s doubtful that shivering is as effective at building up cardiovascular endurance as running is, but apparently it does stimulate the conversion of (mostly) useless white body fat into (much more) useful brown body fat. Brown body fat is “a tissue that is metabolically quite active. Unlike white fat, it burns calories and generates heat.” So I guess this means if it’s too icy/snowy/frigid…
