I have an endurance question...I've been boxing/kickboxing for about 8 months and I'm in the best shape of my life at 32. My problem is I feel like I can't get past a certain point with my endurance. I really do push myself in class and obviously have seen huge improvement since I began, but there is the next level I can't get to. My face turns red, I feel like my muscles are on fire so bad that I can't throw another punch and I literally start to feel sick after doing sprints up and down the gym. I'm not overweight, I don't smoke and I work out 4-5 times a week. Is there something I'm missing? How do u push past this without passing out?
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