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I've also just started 5x5. Lifted a little bit a few years ago but very much out of practice/fitness right now. So not a beginner, but not loads better.
Since it's easy enough to tweak a workout then I've decided to err on the side of things being too easy, and if need be I can nudge a workout up a few kg and let the algorithm handle it. I'm avoiding trying to figure out exactly what my max 5x5 is as I figure it'll get close enough fairly quickly as the weight increases and if it gets a few nudges from me for obviously easy things. Worst case I'll be a few weeks behind where I 'should' be. But given where I 'should' be is entirely subjective then who cares.
Rather than half-arsing lifting, I'm committing to doing 5x5 properly.
I need to dial in my current 5 rep max, but I'm not sure how best to go about this.
I'm thinking of a standard warm up of progressive lifts from an empty / light bar with a lot of reps, to low reps / single lifts as I approach the main set weight, where the set weight is a little bit more than the weight I've been doing for 3x5s recently.
How do I do this without hitting the 5x5 set too fatigued, or choosing a weight that is too light.
Or doesn't it matter that much, and I should just fine tune as I go - My rationale being that, as long as I've got an overall upwards trajectory for the weights I'm adding in the program, the starting weights don;t need to be dialled in precisely. Particularly as the program has room to accelerate / decelerate the progressive weight increase.