colas said..
The back foot will naturally position itself symmetrically wrt the stringer, so you actually only have to focus on the front foot.
Well, not quite. I found out that if the front foot position is the key to the balance, the back foot position is also critical, but more for your stamina.
Since I begin to mainly use low volume (105 litres for my 100kg), narrowish (less than 30"), longer (more than 7'8") and light (4.8kg bare) boards, I kept having some micro-tears in my rear calf that took weeks to heal. This didn't happen before on my 115+ liters, 29"+, 6.5kg+ boards.
I finally built myself a trainer device - that I will detail in the next post - to see what was going on. By standing 2mn on it, I could distinctly feel heat building up in some points in my calf depending on the position of the back foot:
- too far aft and the back of the calf was hurting
- toes too open ("toe out" and the inside of my calf was hurting
I could thus determine that my rear foot should also be in a critical position:
- close to the stringer. Ideally both heels at the same distance from the stringer
- the toes of the rear foot not farther back than the front foot heel
- parallel to the stringer (best, if you can keep the balance) up to 30 degrees angle max
Basically it means my feet were in a kind of "sweet rectangle" (in blue) of 32x48cm (12.5" x 19", for my 10" long feet) on the board by looking at where I was on the pad ridges :