Is it normal to get boner during boxing workout

Jun 8, 2019
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I've just participated a boxing class.
But sometime I've got spontaneous erection during workouts, especially before a sparring in the ring.
This's not associated with sexual stimulation.

Is this normal event for boxer?
I sometime noticed that some boxers liked to touch their crotch with boxing gloves on. I think they might arranging their boners position?

I've searched for physiological reasons
found that boxing can be non-sexual stimulation for erection in boys
or it may associate with coregasm

Does anyone have the same experience?