*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.
WOD/Conditioning 30 Min AMRAP
1000 Meter Row
60' Overhead Plate Walking Lunge - 45/25
Please watch this. Some great tips to familiarize yourself with on single leg squats.