I’m 28yo, 5ft 1in, and weigh 130lbs. I’m not on any type of medications and I’m very active, at least in my opinion. I work out 5 days/week for at least an hour each time. On Monday’s and Wednesday’s I run anywhere from 2-4 miles, in addition to calisthenics. On Tuesday’s and Thursday’s I attend spin classes which last about 45-50 min, and I combine that with strength training. My main problem/concern is when I run. I always get so tired so fast, about 5 min into the run. I always feel like I’m suffocating, or just can’t breathe and I feel like someone has drained all of my energy. I purchased a heart rate monitor, and I've noticed that I start to get tired when my heart rate gets around 170. Once it reaches the 190’s-200, it’s very uncomfortable and sometimes hurt, and I have to stop to catch my breath. I run at a very slow pace but it doesn’t matter, b/c I still can’t complete 1 mile without having to stop 2 or 3 times. If I increase my pace, I just get exhausted even faster.
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