Just finished a HIIT/Core workout, 39 minutes total. Got a great sweat going and feel so much more relaxed now. I'll post the workout in case anyone is interested, no equipment necessary. But as a warning, this one is a 4/5 on their difficulty scale and was challenging to me even with some modifications. So one should be in decent cardiovascular shape before attempting this one.

FitnessBlender HIIT/Core Workout: