Every time you push your foot down you push the snow aside so only a fraction of your energy goes towards moving you upwards and forwards. This results in smaller steps and so more steps to cover your route and more time running.
The resistance, offered by the snow, develops strength-endurance as it works all of the lower leg muscles, ligaments and tendons against the resistance of the snow. You will notice that you work hard to drive your knee up and through and so your hips and even your arms get a great workout as they go through a greater range of movement working against the resistance.
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