24-time Olympia winner Hany Rambod takes you through the importance of the correct foot position for pendulum squats. You want to focus on the quadriceps, so you don't want your feet too far forward as that puts strain on the hamstrings and glutes. You want to have your feet directly under your hips to target the quadriceps.
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Pro Tip: Pendulum squats are not for the faint of heart, but they are an excellent exercise to improve your legs.