I can't find a photo of the really confusing one - the "reverse XC skiing" one. It's something like this.
Starting position (1) has the legs together and arms lower than shown, bent at 90 degrees with elbows beside body, palms pointed down, holding handles. Resistance band is longer than shown.
Extended position (2) would have the left leg back as shown with the glute engaged. The right arm would be straight back behind the body, as horizontal as possible with palm up (holding handle of resistance band) and thumb pointed toward the body. The left arm would still be at the side of the body with elbow bent 90 degrees forward, holding the other handle of the resistance band.