I hate up-down planks — so I did 20 reps a day for 2 weeks anyway and this is what ...
You can read more about how to do an up-down plank with perfect form here, but essentially, you move from an elbow plank to a ...
Tom's Guide27 天
I hate up-down planks — so I did 20 reps a day for 2 weeks anyway and this is what ...
This move torches your core, quads, and glutes.