The following news item contradicts the conventional wisdom that yoga is not a good physical workout and, in fact, is better than Pilates for general fitness.
NY Times – Ask Well: Pilates vs. Yoga
“The upshot? Pilates may be preferable if your primary goal is a solid core, but if you’re hoping to strengthen your upper body and goose your push-up tally, you’ll probably accomplish more with sun salutations and other yoga moves.”
Of course, these studies are small slices of the human experience. You can lose weight maintaining any exercise regime that helps you burn more calories than you consume, and 30 minutes of walking three times a week can meet the minimum requirements for a healthy life style.