Fats Can't Gym Right I go to this workout class called OrangeTheory Fitness (OTF) about 4-5x per week: 1-hour long sessions that you book in advanced, led by a trainer, focusing on HIIT. You wear a heart rate monitor while you're working out so you can see which zone your heart rate is in; not 100% sold on this part of the workout, but doesn't matter, the workout is still great. There are several monitors all around the gym where you can see your heart rate (and incidentally, all other gym goers', important later on). This screen also shows you how many calories (est.) you've burned, given basic information (height, weight, age, etc). The way the classes are designed allow for most people at almost any fitness level attend. For reference, I'm 5' 7 and 130lbs. Let's call this girl Selene - she's probably 5' 5 and at least 180lbs, maybe 200. I have seen Selene around before at OTF, but we would work out in different groups (treadmill vs. weight room) so I don't really pay attention to her. The one time I've noticed her before was when she left the workout studio to "go to the bathroom" for 5-10 minutes. I thought this was strange, but hey, nature calls (probably not)! Last night, we were in the same group (started on the treadmills), and she was on treadmill #1 and I was on treadmill #3, with no one on treadmill #2. We get into our workout, and we're doing a 1-min "all-out" (sprint). I hit 9mph on the treadmill, get up to 9.5, and finish out the minute, no heavy breathing after my first 1-min sprint. Selene? She "sprints" at 6.2mph, makes really loud and air-expelling noises constantly (PFFFFHAAH!), and stops, exhausted and out of breath after 35 seconds. This happens 6 more times throughout the night, as well as on the rowers, 6 times - she would stop rowing after 30 seconds and just sit there, looking exhausted as if she had accomplished something. Why she didn't just lower her mph and keep up for the whole 60 seconds is beyond me.  She also misses an entire block of workout on the weight room floor because she had to "use the restroom" again. Oh and she also thinks she's a super weightlifter or something and wears those stupid gloves. Girl, we're lifting 30lbs in the weight room, MAX.  Biggest kicker? I looked at our workout summaries on the screens after we finished. My estimated calorie burn? 610cals. Hers? 430cals. Almost everyone else's estimated calorie burn was 550+ (even the tiniest girls). Most of the fatties burn 800+. How she couldn't even break 450 is crazy to me.