I'm not clear what a Rebuilder is. I just did some checking and what I do for the circulation in my feet is and I've learned this work from PTs and do it at home every day.

Sit on chair or side of bed, do a marching in place exercise, Do it mild or give it some power. I do 15 times on each food and do 3 sets. The other one that does good is heel/toe flexes and again 15 times on each foot and 3 sets. I do
these every morning after a good night's sleep and all the blood is waiting to be awakened. Maybe this is what the rebuilder does. I know a bout a Rebounder but not a Rebuilder.