This is some very applicable rollerski technique by some very good athletes, specifically they womens USA ski team. I think we can concider them pretty good.
Look at the way they bring their legs under them and have that good forward position. They are also bringing their hands forward quite far and getting good power out of them.
Keep up the good work
This has some classic and some Skate technique, Watch that power they get from their arms and the power out of their legs, they are bringing their hands out in front and their legs underneath them, and they have that nice forward position!