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.

The realization of emerging emotions by cultivating mindfulness. I mean this is basically also what various practices/exercises in (Zen) Buddhism aim at. But I'd argue that the practical methodology advertised by Stoicism is too ratio based to be effective beyond a basic . I would rather put my money on more indirect approaches like classic mindfulness exercises and meditation. They are less goal oriented by design, but the axiom (which I accept from experience and observation) is that a healthy mind will be expressing stoic virtues naturally without knowing how to call it.