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However, no particular type of exercise is a magic cure for back pain. No doubt regular exercise is a vital part of managing back pain but whatever works for you is ok, and more importantly, find something you enjoy and are prepared to keep doing it.
I think this is right.
I've been shown exercises by an NHS physio, & have an information sheet she gave me to remind me what to do. They certainly help. The only problem is that they're boring.
Tim - other than related stretches - it won't help any injury you've just acquired, but if you suffer from back pain after long rides it may well help
Bledlow - you may well find the exercises you've been given are just variations of what you'd get in a Pilates class - there's a lot of crossover between yoga, dance, physio and pilates, but it does tend to have more emphasis on core strength, together with flexibility and joint mobility. IME yoga tends to have more emphasis on flexibility - but in both cases, it's very dependant on instructor, who should ask about any injuries at the start of a class and make allowance/suggest alternatives accordingly.
It was devised as a rehabilitation method - TBH I don't know how much the different schools (or should that be franchises..?) differ, I think our instructor studied with Michael King (Pilates Institute rather than Stott/BC/Winsor AFAIA), but she tends to pull in all sorts of stuff as well as going back to something nearer classical Pilates from time to time.
I'd suggest a by-product tends to be better body-awareness and recognising one's own poor posture, tho' that has seem to escape my OH who did it for some time, but who often has a grumbly back because she stoops when standing/walking
FWIW the 'semi-supine' is the neutral-spine position start point for a good chunk of Pilates - there shouldn't be anything pulling yer back out of alignment (typically - straightening the legs down).
I often used to have trouble with beds, hotel or otherwise, when on holiday - doesn't stop me waking up with some backache on an unsuitable mattress but it seems to have given more resilience and I shrug it off pretty quickly. It's certainly kept me ticking over even when I wasn't doing anything else fitness or flexibility-wise.