I have been using the last stage of the Barefoot Science Foot Strengthening System for 2 weeks now. I am going to keep using them for a while because I don't feel done yet. The muscles haven't firmed up yet and I can tell if I quit now, it will all be for nothing.
The pain in my feet and knees is greatly reduced after 3 months. Because I have a structural problem, I might have to keep wearing these, but that would be no hardship. That would be the same pain that there was no quick and easy solution for as long as I was wearing moccs and sandals and Converse as my only shoes.(Imitation Converse and Scotchguard is my idea of keeping dry or being presentable. It seems a hunk of moose on each foot is not acceptable at times and I don't even have a job.) That would be the pain they wanted me to start wearing knee braces and prescription shoes for. Its about 95% gone. I'm not wearing those.
I got stuck at the 2nd stage for a month and the 4th stage also. When I couldn't take anymore I walked in a pair of moccs that would be impossible to wear orthotics or arch supports in. Nothing but glove leather and foam. There were plenty of days that I needed to not use them because MY FEET NEEDED TO REST. You work muscles long enough, you might want to take days off to not hurt and I did.
Did it make this longer? I don't know or care. It made this doable.
Other people have said they had muscle twinges all up and down their body while retraining their feet muscles. Me too. Some days I felt stiff and sore like I had a complete work out, instead of walking a very tiny dog slowly down the street and back. Listen to your body more than a time chart if you try this. If you aren't ready, don't progress. Pain means stop.
You can look at my old posts to see what all things I have going on with my feet and knees. Enough to say here its a little past what bad shoes and bad posture can do.
Its been fantastic. I really didn't expect quite this much improvement. I'm sure I'm going to have some interesting conversations with my medical team.