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10,000 Squat & Plank Challenge (in 30 Days!) | Joanna Soh
Plank Challenge App Review
How to Plank Properly for Beginners - Step By Step Tutorial
30 Day plank challenge | Day 3
30 Day plank challenge | Day 4
30 Day plank challenge | Day 30
30 Day plank challenge | Day 6
6 MIN PLANK CHALLENGE - A Core and Arm Workout!