Wrestling

It looks like he has put the man into an armlock and made him almost tap out.

His facial expression looks like he is struggling with pain.

The man has the other opponent into a perfect position to make him tap.

Their veins are pumping and they have tight grip around each other.

The facial expressions from both opponents look like they're tired and weak. This is a wrestling move called the anaconda. They use it to make the other opponent tap out.
Their hearts are pumping with tiredness and they look like they both  want to give up.