Last year, Dec. through March, I wore a homemade back ADS on average for 30+ hours a week. Feb. and March I also did edging and started some clamping. By April I was measuring .5 inches longer bpel. I stopped in April because I was tired of wearing it, and the rate of change had decreased a lot.
I have been doing PE off and on for 13 years. I had been on a year break before starting that phase. Also I had already cemented a 1” gain from years past, so, this was not newbie gains. I have gained no additional length since last spring, but I haven’t lost it either. I have been playing with pumping since stopping the ADS.