Parkour moves: Underbar
With underbar you can slip under bars or pipes or between them. Run, jump towards the obstacle feet first so that the feet go between the bars. At the same time, grab the upper bar and pull yourself through the obstacle.
Things to take into account
Jumping with your feet first may be difficult in the beginning. Practise by going through holes big enough.
Where to start
Climb and sit on the lower bar and take a hold on the upper bar. Pull yourself carefully through the obstacle.