Look at everyone in the background. They are practicing footwork. It is amazing to see some boxing school teaching serious footwork and not just handwork and body work. Most boxers today have very clumsy footwork and rely solely on making weight to fight much smaller boxers to win.
I've just taken up boxing. All my classes start with just footwork then we slowly incorporate punches. I agree the footwork is the most important thing. It's really challenging to sync your footwork with punches. Hence why I'm here to practice my double jab
To keep the rear hand covering the face while throwing the jab is a masterfull teaching, i came up with this a long time ago i thought i was the only one doing it because in my gym they teach to keep the gloves close to the face, i honestly prefer to have my lead hand extended ready to jab faster and my rear hand covering my chin with the palm open as the coach said.
John 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
Russians are very classy and skilled boxers from my experience in the ring with them, definitely had some close fights with them and learned from my boughts