Novak Djokovic was spotted using a magnet on his chest at the French Open,  presumably to reduce pain or inflammation.

It’s great to see top athletes taking advantage of the benefits that magnets can bring.

Hopefully, we’ll see Novak on winning form, helped to victory by using a magnet.

I’m not sure if athletes can wear bracelets whilst playing, but we’re more than happy to send him one of ours, it will help him in exactly the same way, and look much better.

https://www.tennisworldusa.org/tennis/news/Novak_Djokovic/133432/novak-djokovic-revealed-what-is-the-device-he-wears-on-his-chest/