Lateral support and assembly

The invention relates to a support for supporting a leg during skiing or skating. It is a lateral support (5) having a longitudinal direction (L) and lateral direction (W). It comprises a bottom (8) that has an upper surface (10) and a lower surface (9), as well as an inner edge (11) and an outer edge (12). At the lower surface (9) side of the bottom (8), there is at least one means (14) to fasten to a longitudinal rail (15). The support also comprises a support element (7) which has an inner surface (16) and an outer surface (17) and which proceeds obliquely upward from the inner edge (11), so that between the plane of the upper surface (9) of the bottom and the inner surface (16) of the support element (7) there is an angle (a) that is at most 120°. The invention also relates to an assembly which comprises a support for supporting a leg during skiing or skating.