Cramps in feet when sitting flat

Hi,
I have a problem when sitting on the floor flat I get very bad foot cramps to the point where i can't even feel or move my feet at all and can't get back up.
This is especially a problem since i've just taken up canoeing & kayaking and getting out of a kayak under these conditions is very difficult and dangerous.
Generally i never get any cramps at all, it is only when i sit flat on something with my legs out straight in front of me.

Can anybody please help?
Thanks.
- Richy :wave:
 
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