i always feel tired af and light-headed after some 1x5 heavy

Not sure

Yes, I've seen a couple of videos of people passing out from doing heavy deadlifts.

>>42139821 sometimes, remember to control your breathing anon.

Breathe in AND out when the bar reaches the floor. Reset form. Brace yourself.

i get really light headed when i do T-bar rows lol

>>42139821
yes, you're probably still a novice
drink water
go weight training on a empty stomach only (unless you're doing a cardio-only training session)
drink water
make sure you eat enough sodium, potassium and magnesium (don't over-supplement those thou)
drink water
but most importantly
make sure you approach heavy taxing compound that will likely require you to hold your breath for the whole execution only once you've taken some DEEP BREATHS
make sure you BREATH in-between reps if you're doing conventional diddlies

breathlets, when will they learn
sadly most people skip learning breath basics on the major compounds. breathing technique is fundamental to all of them

>>42139946
This. I find when I take some real deep breaths and then one final one on my reps to brace tightly it increases what I can lift quite significantly.

>>42139946
Thanks for the tips.