I do it in my basement. 5 bad disks, 2 bone spurs in my neck, recon lt knee, lt elbow recon. tear in rotator cup, grade 3 tear in a.c. joint. some other things also. I don`t like to hear other people 10-15 yrs younger whine about how they can`t do this or that.They are just plain and simple lazy.I hurt worse and feel like crap if I don`t work-out. i don`t have a cushy job either. 35 yrs doing bodywork on cement.