Subscribed to this:
Although don't watch all of them.
I used to watch a lot of boxing videos posted up by a guy called BilliardJay who eventually got his account disabled for recividism. Lots of heavy bag / speedball workouts and traning lessons done by Freddie Roach. Now I just have a hodgepodge.
If you can get past the fantastic girl in these videos, the breadth of exercises and techniques she uses is pretty good: