Dual Bench Low Plank Knee Extensions

Setup two benches or boxes far apart so that your elbows are on the edge of one bench while the toes are on the edge of the other bench. Stay on your forearms (you can grab the bench edge with your fingers) and bend your knees until they come close to the ground directly under your toes. Keep your abs and glutes squeezed the entire time. Flex your quads to return back to the low plank position with locked out legs.
You will using lots of lats, serratus, and core strength here as you will need to flex the shoulders creating space near your armpits when you are in the bottom position. This will stretch the lats at the bottom and require them to be contracted to return back to the top position.