Thursday is another one of my cross-training days, and I almost always choose indoor cycling. I'll take a 60-minute Power class at Flywheel or a 45-minute indoor cycling class at Equinox called The Pursuit: Burn. Both indoor cycling classes involve high-intensity intervals of speed and resistance where I feel like I'm working at my max, followed by periods of recovery. It's a much more challenging class format than a steady-state cardio workout, and I always leave each class feeling gassed.