after long plunges I'm mostly shivering for a long time and it's hard to go back and focus on my work but then again I keep mine at 33 degrees...it's a Forge and I've had it for 2 years...I also have a hot tub next to it for contrast therapy...welcome to come and try it anytime (i'm near DT ATX). sometimes i do 3 min cold, 3 min hot, and repeat 2 more times.