Are you in an organized position with your upper body& hips?
Tight muscles in your low back may be pressing into the nerves that go to your lower leg/foot.
A tight piriformis can compress or irritate the sciatic nerve which can cause numbness in the leg/foot.
Pro Episode # 45 – Pro user Request Friday: The Dread Piriformis Syndrome (Like the Dread Pirate Roberts…but Different)