This week we follow Zack 'King' Khan put Chemical Warfare athlete, Kirsty Duffield, through the toughest glute workout of her life in the new episode of 'ZKK Under Construction'; Zack's Top 5 exercises to build your glutes. Kirsty is a FitX and NABBA champion, but will she survive a workout with Zack? Let's see what she is made of ! 👀
Plus, this is a special episode with a little competition for you to get involved in!
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