We wouldn’t dare question 6-foot, 275-pound Steelers linebacker James Harrison. Yet some people have recently been asking Harrison why he wears a full sweat suit in the gym. 

So he took the time to answer in an Instagram video—while pushing up 225 pounds on an incline bench press.

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In the video, Harrison proclaims, “I don’t want to disturb people who come in here . . . to work out . . . just because my arms . . . are so damn big!”

Related: The METASHRED Extreme—Maximize Muscle Growth and Shred Body Fat With This Ultimate Fitness Experience From Men’s Health

No doubt you’ve seen guys in your gym wearing multiple layers while lifting weights. (Granted, those guys probably don’t look like Harrison.) 

What gives? The popular wisdom is that the more you sweat, the more calories you burn because your body is heating up. 

But this isn’t quite true. Achieving a hotter core temperature from layering up doesn’t really mean that you’re burning that many more calories than you would in a Speedo. 

Related: The Best Gym Gear of 2016 

One study in Physiology & Behavior found that people who were kept in a respiration chamber at 81 degrees (Fahrenheit) burned only about 10 more calories an hour than those kept in the chamber at 72 degrees. 

Any weight loss you experience during intense sweating is usually water weight that you’ll regain as soon as you rehydrate. 

Related: How to Stop Sweating After Your Workout 

While there doesn’t seem to be a tangible fitness benefit to wearing a full-body sweat suit, sweating does excrete toxins, one small Canadian study suggests.

If you’re looking for a great sweat (without pressing a barbell over your head), discover The Surprising Way Saunas Help Your Heart.