Part of practicing Stoicism is to bring emotions up to the understanding, examining, and choosing level. You still have emotions, but you don't let them control you.

I love JiuJitsu because many parts of it are like microcosms of life. The first time someone lays on you and you feel like you can't breath, you panic. That's an emotion. After a few times you realize you can breath and eventually you will feel the panic and instead of succumbing, it'll wash past you. By practicing feeling emotions, especially negative ones like being uncomfortable over and over, eventually they move into your higher level thinking and no longer control you. You absolutely still have them, but your reaction to them has changed.

I would actually argue that the sensation from experiencing asphyxiation is not really an emotion but instead one of the most fundamental sensations any life form will experience. Just saying as I already argued that ratio is a layer above emotions. Having said that, Jujutsu (as well as all forms of martial arts and sports) are intertwined with emotional experience and needs. Jujutsu for example is probably one of the best physical therapies for adults to overcome fear of non-sexual physical contact. Also the whole idea around fighting other people in your spare time draws its inspiration from a desire to externalize negative emotions which are either too abstract or too challenging to address in a mental reflection process.