My tub is just past 4 years old this month. Today I may have appreciated it more than any other day. We bought an eliptical machine for working out. I've been going to the gym for awhile, but always use the treadmill. So after the first workout on the eliptical I woke up this morning and could barely walk. The tub is at 104, I diverted all the power to the foot jet and turned that pump on high for 20 minutes. I can walk again.