Hmmm just did some HIIT right now and before my max was about 13 minutes. Now I couldn't even do 9 minutes
Legs got really tired (could've been from kickboxing, but I did HIIT before after kickboxing) and started feeling some chest pains too. First time during cardio for me. Hmmm. Will check again next time to make sure this isn't just some freak occurance caused by something else.