Did some intense shadowboxing rounds on Wednesday after squats. Experimenting with breath restriction using a respirator. I am under no illusion that I'm somehow going to blood dope or accurately simulate elevated environments this way, which have been copiously debunked, but it DOES get me used to fighting under a suffocating blanket of misery. I notice that this sensation is the hardest part of sparring when using my headgear with full face-mask and I start to gas. I've never quit from feeling like I'm unable to breathe, but I've had to fight the urge to.

I really liked it. Started having a challenging time about 8 minutes in of hard striking. Will keep using this until I buy a specialty mask.

Some new basics to emphasize that I gleamed from a YouTube video: sit in your punches much more. Get the legs to do more of the work.