What are some advanced exercises to develop punching power and speed?

You may do these exercises: 1. Speed bag punching 2. Punching with light dumbbells 3. Punching against rubber band.

Yea, it's called slow movement training. By taking a technique that lasts 1 second and using it at 10% speed, so it takes 10 seconds for you to do, you will be able to achieve full kinetic muscle chains with regular (not hard, just regular) practice in 6 to 12 months. Equivalent to what other people who don't use this training methodology will obtain in 2 to 5 years. Optimum cycle is 10% speed, 50% speed, and 100% speed for 3 total reps. That is one set. Repeat the set until your training time is over for the day. If you wish to burn cardio, you can chain 10 100% speed reps together, then add in 3-4 slow movement reps to balance it out at the end to cooldown. So the secret is that slow is fast. If you think this is counter intuitive, it's probably why most people can't fight their way out of a paper bag.

Easy you need to train explosiveness. You can do this 2 ways. Olympic style weightlifting or plyomtrics. the bench press produce 300 Power Watts. Squat 900 power watts the clean and jerk over 3,000 power watts.