I completed the RSR in Dec last year. Got a 10kg gain from 140kg to 150kg @ 86kg BW. It was my first time running it and if I was to offer advice to anyone it would be:
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Do not start it unless you are healthy and injury free
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Don’t plug in your absolute max, use a ‘gym’ max - a weight you can say nail on any given day without a psyche up
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Work your abs like a mofo, your back will thank you for it and the weights in week 4 onwards won’t feel so heavy on your back
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Stretch and foam roll every day, multiple times per day if possible
It is fairly brutal if you are only accustomed to squatting heavy once per week (not sure if you’re in that boat, but I certainly was). I had no injuries going into it and by week 3 I was getting stiffness in my TLF on my left side. I was using a foam roller up to then but decided to change to a wooden rolling pin. Rolled my TLF, IT band and piriformis every day. Hurt like hell but the stiffness went away by middle of week 4 when the weights start to get heavy.
It sounds like this was a pre-existing injury you took into the RSR, and you mentioned you rounded your back to finish some reps and almost rolled your ankle on every rep. This is a recipe for disaster imo. I would stop the program and make rehab of your ankle #1 priority.