*If you have pistols pretty well already, I would work on overhead pistols. Even if just using a PVC. You'll get that much better at pistols because of it and as well it will get you more than read for the OH Plate Walking Lunges.
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WOD/Conditioning 30 Min AMRAP
1000 Meter Row
60' Overhead Plate Walking Lunge - 45/25
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Please watch this. Some great tips to familiarize yourself with on single leg squats.