Nordic Skiing Technique Tips - Half (Marathon) Skate

Use the leg push of the free skate, but on only one side of the body. Use double poling in the first half of the push; the result is propulsion in the direction the push ski is pointing. Turn the body toward the glide ski as the hand reaches the hips during the double poling action. Use double poling and leg push in the second half of the push. Extend the arms and the push leg completely, and finish the push phase at the same time. The body weight moves to a balanced position over the glide ski during the recovery phase.

These points are taken from "The Instructor's Manual for Teaching Nordic Skiing" put out by CANSI

Diagonal Stride	Double Poling	One-Step Double Poling
Uphill Diagonal Stride	Herring Bone
Free Skate	Offset	One Skate
Two Skate	1/2 (Marathon) Skate	Diagonal Skate
Snowplow Turns	Basic Christie Turns