Cross country skiing is a great winter activity for the whole family and a full body workout. One can basically go skiing in all bigger parks around Moscow.
But if you are looking for the good tracks our favorites are :
Odintsovo Park

This is a great park for cross country skiing just outside Moscow. They have rentals, tracks and a nice coffee shop. Address: 3 km Krasnogorskoe schosse, Odintsovo https://park-1.ru/Ski
Stadium Zorkiy

This park is a short drive from MKAD.
They have around 25 km of prepared ski track. Some advanced ski tracks and some for beginners and children. Address: Ulitsa Rechnaya 37, Krasnogorsk, Moskovskaya oblast
Photo credits: Trip advisor