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Ben Greenfield

Ben Greenfield is a fitness writer and biohacker who appears in the workout session alongside Efron and Chris Williamson.

Circuit updated September 28, 2026

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Zac Efron says eating too much salmon during The Iron Claw prep gave him mercury poisoning
Health

Zac Efron says eating too much salmon during The Iron Claw prep gave him mercury poisoning

Efron says the 6,000-calorie bulk for The Iron Claw pushed him from a 29 waist to a 34, up to 205 pounds, and into a fish problem.

Sep 28, 2026