I don't go down as strictly though. When I go back down to touch my thighs to the bench i make sure to not let my back arch, the whole back should be touching the bench...basically forces you to keep them contracted.
Comments: Feeling great as usual even with 7ish hours of sleep last night (much less than the normal 8-9 I get). Stoked about the chins, I've never been able to do all sets of 8 before. Everything else climbing up very nicely. Everything feels incredibly light and still feeling very explosive. Speed squats are fun. I accumulate so much power from the hole that my feet actually leave the ground at the top of each rep. Kinda like a heavy ass jump squat lol. I might need to watch out for extra unneeded stress on the spine but I feel great so far .