What equipment used in a triathlon?

Bobsled

your hands and legs

Dr Naismith

A Bat Mitzvah takes place during a prayer service. No equipent is used, although Jewish men (and some women) generally wear a head covering and a tallit during Torah services.

The gas that you can use is filtered air or nitrox, which is nitrogen enriched air. There is CO2 used for some BC vests also for an emergency, you can detonate the CO2 to get up to the surface.