I`ve done athletics for 8 years orso and in the High Jump you also have to know your front foot before you can start this dicipline.
The method we used to know this is: Let a person stand up straight and push him from behind, the foot he lands first on is his 'leading foot'.
I`ve always thought this was a strange method, but nevertheless it worked very fine for us. And I never saw a person for who this trick didn't worked.
In my experience the 'leading foot' is the same for snowboarding and High Jump (altough this are lousy statistics, it is aleast a method

, it would be nice if more ppl tested this method)
PS: If you try to test someone's best food. Don't tell him you'll push him, people tend to cheat
