Sietse van Berkel: December Indoor Clips 2020 Posted on December 29, 2020 by Effraim — 3 Comments ↓ Sietse van Berkel is blessed with an indoor quarantine riding spot to get him through the winter and is taking full advantage. The pendulum pivot line at 1:34 stands out for me in this December indoor clips 2020 raw edit. Well worth a watch!