Movement on a swing is all about momentum. If you get the right push and move your legs in the right way it can keep you going for a long time.
Movement at a roundabout is all about speed. Get your speed right and you can make the most of the gaps that appear in the traffic. Too fast or too slow and there’ll be a collision.
If you get the right pushes, carefully manage your momentum and speed through life, you can do great things. If you lose control of any one factor though you will crash.
Look after yourself.