Soaking in a hot tub has many of the same benefits as a 30 minute jog. Probably doesn't do much for building muscle though.
www.the-sun.com

Soaking in a hot tub has 'same health benefits as a 30-minute jog'
SOAKING in a hot tub has some of the same health benefits as going for a 30-minute jog, a study suggests. Scientists found people who submersed themselves in a Lay-Z Spa for half an hour experience…
