Josh wrote:I'm up for it, I don't know my current 1RM (I'll try work it out later, is adding 2.5kg doing 1 rep, rest for 15 minutes and repeat, would this be a good way to test it?)
I'm at 80kg for 5x5 and still adding weight every workout.
Body weight 83kg, planning to be about 70/75kg by the time a try it.
I don't think you need to rest 15 minutes, this is excessive and will "cool" you down increasing the risk of injury. I think i've heard the best way to do it is; choose a weight that you will definitely make but heavier than usual (heavier than your 5rm if you know that) increase weight by 3-5% each time, rest 4-5 minutes... unless you choose a very low weight initially this should be a pretty good estimate of your 1rm.