When you uppercut should you use the legs to drive upwards in the direction of the punch like Tyson appears to do, or is that not how its done, is an uppercut purely from the rotation of the hips/
http://i36.tinypic.com/23r3ebr.jpg
http://i.imgur.com/3rLZlSv.gif
http://s3-ec.buzzfed.com/static/enhanced/web05/2012/6/15/14/anigif_enhanced-buzz-31703-1339784223-14.gif
When you uppercut should you use the legs to drive upwards in the direction of the punch like Tyson appears to do, or is that not how its done, is an uppercut purely from the rotation of the hips/
http://i36.tinypic.com/23r3ebr.jpg
http://i.imgur.com/3rLZlSv.gif
http://s3-ec.buzzfed.com/static/enhanced/web05/2012/6/15/14/anigif_enhanced-buzz-31703-1339784223-14.gif
Tyson's uppercut is unique to Mike. We used to call it the "alligator death spin" because of how he twisted his body and roll. That was one of the most vicious uppercuts in boxing. It used to be mike's Marquee punch. Once he stopped using it I knew his prime was over. Just like when Floyd stopped using his Cobra punch or the leaping left hook. Once fighters stop using their trade mark punch it is over. So, yeah, if you could master that you would be effective, and I said "master" because use ineffectively, like missing, it could leaves you out of position to be countered.
When you uppercut should you use the legs to drive upwards in the direction of the punch like Tyson appears to do, or is that not how its done, is an uppercut purely from the rotation of the hips/
http://i36.tinypic.com/23r3ebr.jpg
http://i.imgur.com/3rLZlSv.gif
http://s3-ec.buzzfed.com/static/enhanced/web05/2012/6/15/14/anigif_enhanced-buzz-31703-1339784223-14.gif
You'll notice even tyson had different technique depending on the situation. In the first gif he was in against a defensively minded guy hunching over so he threw the lead uppercut out of the southpaw stance. Notice how he slid back to make room for his shot.
The second gif is the best example of him springing. He was in close against a taller opponent. His work ran the risk of being a bit smothered so he added some of his own weight to the punch to get the job done.
The third gif is beautiful. Mostly all core work there. Range maximizing. Uses all the rotation he can to eke out the most distance possible with the right uppercut out of the orthodox stance. Just beautiful.
But yeah, my answer is your tactics should vary depending on the situation and opponent. Just like Tyson's did.
Don't mimic Mike in those gifs. It worked for him in those specific scenarios but he often lifted himself off his feet, got his stance all out of wack, dropped his guard, etc. Do that when you're learning and you'll get punished for it.
As far as generating power goes, it depends how you're setting it up, which hand, etc. Generally, you don't want to spring too much or you end up in a bad position.
When you uppercut should you use the legs to drive upwards in the direction of the punch like Tyson appears to do, or is that not how its done, is an uppercut purely from the rotation of the hips/
http://i36.tinypic.com/23r3ebr.jpg
http://i.imgur.com/3rLZlSv.gif
http://s3-ec.buzzfed.com/static/enhanced/web05/2012/6/15/14/anigif_enhanced-buzz-31703-1339784223-14.gif
Love how ribalta bounced right back up from that shot and looked at tyson like he was mad he landed it.
Both. Not everyone is as explosive and athletically gifted (Tyson was an athltic freak) to do it like Tyson but the momentum and leverage is there. Kind of like a lead hand hook to the body in mid/close range. That same motion of slipping and ****ing at the same time to deliver with your entire body (hip rotation, back and lead foot pivot/explosion) while maintaining your balance.
When you uppercut should you use the legs to drive upwards in the direction of the punch like Tyson appears to do, or is that not how its done, is an uppercut purely from the rotation of the hips/
http://i36.tinypic.com/23r3ebr.jpg
http://i.imgur.com/3rLZlSv.gif
http://s3-ec.buzzfed.com/static/enhanced/web05/2012/6/15/14/anigif_enhanced-buzz-31703-1339784223-14.gif
You use an uppercut like Tyson when your in the inside when you throw an uppercut from the outside you wind your arm look at Roy Jones in his prime when he threw his upper cut from the outside or long range and you'll see its thrown different