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warm up sets are minimal really 1st is approx 50/60% of workload for 5 reps or so then another warm up at 70/75% for 2 or 3 reps and during 5s will add another single rep at 80/85% and for squats and deadlifts may add another 1 or 2 sets of singles depending on how I feel on the day.
Another issue maybe is I do not zig zag, at the end of each cycle I work out a new 1 rm on all exercises and then for the 15's I work at 52.5%, 57.5%, 62.5% & 67.5% of that figure, 10's are 70%, 72.5%, 75% & 77.5% , 5's are 80%, 82.5%, 85% with the final session at 88/89% of the new 1 rm EDIT which means that during the 10s and 5s I am starting at approx 90% of my RM then 93% then 96% then obviously 100% of my RM