OK my stamina even in the judo days like 3 years ago have always sucked. i tried to finish of my opponents in first minute and usually did. if i didnt my chance of winning would deterioriate because of my cardio. i have always had bad cardio mainly beacuse of my crappy work ethic. i never really trained that hard because i used to be the best in my school and won most tournaments i went in. however after a 3 year break (mainly cause of poker and other things), i feel like this is 1 area i want to fix. i go to renzos now and after first 2 days, every time half way through the class i feel like dying. i am dead tired. i feel like im slowing my sparring partners down. usually i will get tired near the end but its still worse then everyone else who seems way more in shape then i do. after the class i will literally feel like throwing up. sometimes even passing out but i take my time to get dressed and go home. is this normal? my recovery time is terrible. i need a long time to recover. please everyone tell me your thoughts and what i can do to get better. i am sure going to training everyday will slowly fix my cardio problem but i would love to speed this up as much as i can. i guess running is a start.. is this even normal feeling THIS bad after training. everyone else seems very normal except me and my crappy cardio. i feel like throwing up every time after training and got an extreme headache. during judo times i was told to get a docs note saying my heart was fine. i got an ekg done and it came out normal. so i gues it is just me being out of shape. (i play poker online for a living which might have added to the problem).