The Plank on Top is an athletic take on the traditional Doggy Style position. The receiving partner lies beneath the penetrating partner on either their front or their back. The penetrating partner then holds a plank pose while sliding into the receiver - and holds it for the duration of the Plank on Top position.
To increase friction and help control the action, the receiving partner can wrap their legs or ankles around their partner during this position.
You can further increase the fun with a hands-free toy, like the Satisfyer Backdoor Lover plug, pictured here.