If the stress is too severe you'll have trouble, maybe you split the whole team up, maybe one person quits, etc. Maybe somebody files a lawsuit.

Note a few percent of people commit suicide in basic training because of the severe stress involved. https://www.armytimes.com/news/your-army/2020/09/21/fort-sil...

Encounter groups (e.g. "T-Groups") got a bad reputation in the 1970s because they could put people under extreme social pressure.

A few years back (before Ozempic) I'd had an incident where I developed a psychogenic fever after extreme stress which caused me to lose about 15 pounds. (The psychogenic fever is caused by the nervous system activating oxidization of brown fat, which can persist for a few weeks)

I've made some half-hearted attempts since to induce a psychogenic fever including attempts at biofeedback with a thermometer. If I just had some way to measure the tone of the neurons that go to those brown fat cells... Thing is, anything I could expose myself to get extreme stress would be pretty unpleasant, never mind dangerous.

I bet you could cause enough stress by getting 20 people to bully one person in an encounter group over the weekend but that's the kind of experiment you'll never get past the human subject review board.