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10,000 Squat & Plank Challenge (in 30 Days!) | Joanna Soh
Plank Challenge App Review
30 Day plank challenge | Day 3
Longest Plank EVER - Guinness World Records
30 Day plank challenge | Day 4
30 Day plank challenge | Day 30
8 MIN PLANK WORKOUT CHALLENGE (No Equipment)
Best 5 Min Plank Workout For Tighter Waist | + Quick Ten Day Abs Challenge! Who's In?!