I learned it the hard way
So i do periodization and i do two weeks hypertrophy as my main focus and i love training till failure in almost every set even though some people say I should not because......and i still did it no matter what people said. I trained till failure because i love the feeling of the pump and feeling like my muscles are being used completely. But today i paid the price. After finishing my workout i felt horrible, for the first time i felt just horrible. I had nausea, i felt like if i was about to faint. I tought maybe I should eat something so I grab the first thing in sight some papaya and well it has fructose so it would help me. But i couldnt hold it I went to the bathroom and threw up. Thankfully it wasnt that bad and afterwards i felt ok. So the lesson is i will never train till failure in every single set maybe just the last set of my workout. and specially if i train four days calishtneics back to back. so yeah DO NOT TRAIN TIL FAILURE IN EVERY SET PLEASE.