 My wife, she's had foot surgery. She had plantar fasciitis. She's now walking around in two pairs of G to five shoes because they're giving you something called trampoline like energy return. And all that really means in plain English is you're bouncing off the pavement. OK, so if you are somebody who's taken a beating in their joints, OK, who does have a lot of wear and tear and you got some running around to do.