In this, the legs and feet are closed; the knees are bent till the calves nearly touch the thighs; the upper part of the body, kept straight, is inclined a little forward; and the arms thrown in the direction of the leap, which increases the impulse, preserves the balance, and may be useful in a fall. ([Plate X.] fig. 1.)
Plate X
Leaping.
Leaping.
The vertebral column, and consequently the whole of the trunk, being thus bent forward, a strong contraction of the muscles preserves this bending till the moment when the leap takes place; then, by sudden contraction of the extensors, the body stretches out like a bow when the string breaks, is thus jerked forward, and remains suspended a longer or shorter time in the air.
In descending, the person should be rather inclined forward; and the fall should take place on the fore part of the feet, bending the knees and haunches, to deaden the shock and descent; for, the direct descent in this leap, if not thus broken, would send its shock from the heels to the spine and head, and might occasion injury. To perpendicularity in this leap, should be added lightness, so that scarcely any noise from the leap should be heard.