In Jogging: How to do a Plank: Training Essentials and Workouts: Runner's

I've been doing an ab routine every night. Part of that routine is planks- 6X20 seconds with 10 seconds rest in between. Cat:TrainingForum:658106477Discussion:e1e1ee8c-b066-4efb-960d-ec9d9f23e315 [
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