Not exactly what you are asking for, but perhaps of interest to you. My problems started with exercises... I had a regimen of stationary biking for the whole w

Not exactly what you are asking for, but perhaps of interest to you. My problems started with exercises... I had a regimen of stationary biking for the whole winter (7 miles on alternate days). By late winter I had serious buttock pains sitting in a chair or driving after about 15-30 minutes. Dr and physio could not diagnose it. Finally did some internet self diagnosis and came up with piriformis syndrome - had to do with the biking/exercising one set of muscles in one direction and not exercising alternate muscles/directions. I am now following some exercises that take about 30 minutes per day, and give me considerable relief but there is no long term fix for this. Moral: When you do exercise try to pick exercise that have many dimensions.