He spoke with fire in his eyes, often fists clenched for emphasis, not injury.

Writing on Instagram, she said: "I have TMJ and wake most days with awful headaches from tension & jaw clenching."

He often wore wire-rimmed glasses, and his jaw jutted forward, as if clenched.

The retired aerospace engineer, who lives in Sierra Madre, did about four reps before his teeth clenched, his legs trembled and he let out short puffs of air through pursed lips.

As he was moved into the ambulance “his jaw suddenly started to clench down”, she said.