How large are the forces acting on a gymnast swinging on the high bar?

In many sports a particular tactical conundrum arises. The team captain has to choose the best order in which to use a group of players or set-plays in the face of unknown counter choices by the opposition. Do you want to field the strongest players first to raise morale or play them last to produce a late run for victory? John D. Barrow shows that randomness holds the answer.

It's Monty Hall, only better!

Where's the sweet spot?
..You can see forever. Or can you?
What's the mysterious stuff that makes up 70% of our Universe?
Are the unchanging features of the Universe really unchanging?
Did the Big Bang mark the beginning of time? Not if we live in a bubble multiverse!