Maggie's Farm

This fit, skinny female is talking about fat-burning, but this is really about cardio fitness and leg conditioning unless you are overweight. Fat loss comes from diet, not exercise. 

Whether your cardio includes rowing, treadmill, stair machine, biking, or outdoor running, it is the intense intervals which make a difference for endurance - thus Quality Work vs. Garbage Work. Variety is key. When people say "Walking is good for you," they refer to people over 80 or obese people. Hiking maybe, but not walking.

She talks about 20 mins on those stairs. No way I could do stair intervals for 20 minutes. More like 6 minutes. Anyway, it's a damn good and demanding thing to do once a week. My cardio workouts take longer because I cannot handle such high levels of intensity. Not ready to die yet.