According to director Chris Fisher both Olusanmokun and Jess Bush did most of their own stunts as Dr. Benga and Nurse Chapel in "The Broken Bow," proving that doctors (and nurses) can be more than healers.

Source: https://screenrant.com/star-trek-strange-new-worlds-mbenga-fighting-doctor/

As Hemmer grew more frustrated by the other crewmembers' insistence that they were characters from a storybook written by Benny Russell (Avery Brooks), he ran into Dr. M'Benga (Babs Olusanmokun), who also remained in his right mind.

Source: https://screenrant.com/strange-new-worlds-hemmer-best-surprise-character-why/