its mostly in a races , this year there hasn't been many , the ones i did when i pushed over my limit i get a burning in my stomach an di feel like i have to poop my gut area ( stomach intestines ) feels like how my legs feel , like there is lactic acid build up , my lung usually feel fine even at high heart rate , this a very specific situation , when im screaming over my limits try to bridge on my own or sprint the to finish , i will always have a lack of fitness but this is not because im not fit enough , its because i haven't done enough reps and enough races and im not used to that sickening feeling , its more amplified this year because i have only 5 races when i would usually have 20 , just wondering if its possible to ease that , i have heard baking soda can help but i dont know i thought there where experts here LOLOL!!!!