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it’s more of a sympathetic v’s parasympathetic system thing.
releasing the neuromuscular system requires relaxation and it’s a very cathartic activity.
The reason he talks about doing it after is because once you’re relaxed and activated that parasympathetic system, its then
1. difficult to get yourself up for your work and activate the sympathetic system, from that relaxed cathartic state
2. you’ve relaxed the muscle and then potentially hammering it again and making it tonic/tense with the work out.
I suppose it depends on what your aim is – is it to relax in order to free up for movement like you’re doing, or, is it to release tension and allow the muscle to relax to aid recovery.
that’s my quick thoughts on it anyway 🙂