Oh right, sorry, you mentioned that. I forgot that he recommends two tennis balls taped together for the thoacic mobiltiy one. I actually don't agree with someone starting on that.
A foam roller would work fine but try a rolled up towel or two rolled up towels. All you need is something in place to act as a sort of "hinge" for your upper back to pivot on. I don't get the tennis ball thing and it is not necessary to have all your weight focused on just two tennis balls. I never even bothered with it...I use my foam roller or a rolled up towel because I figured it wouldn't 'feel right'
Wall slides are great. Really great.
I'm impressed by you sometimes, Pity.
Sometimes 