Boxing

Theoretically, as few as just one. Extend your arm with your tricep and your hand flops forward into your opponent's face. Mission accomplished.

For an actual punch as hard as you can with good form, all muscles in your hand, your forearm to twist your wrist, tricep to extend your arm out all the way, Bicep to bring it back to guard, all areas of the deltoid, and a little bit of you pecs where the tendon connects to the front of the deltoid, Also your lats to keep your arm up and lats for full extension, because the are connected to traps, and deltoid, your abdominal and obliques to twist your body with the punch for more power, and also your hip flexors, all leg muscles (whether you twist rear leg or not for power) to keep you standing and balance after the punch so you don't fall over.

Joe Lewis and Max Schmeling came together twice with Schmeling winning the first bout by KO in round 12 and Louis winning the second by TKO in round 1.

The circumstances leading up to their first fight were more boxing achievement / ranking than political. Schmeling had won the Heavyweight title in 1930 by disqualification from Jack Sharkey. However, after only one defense, he lost the title back to Sharkey in 1932.

By the time Louis and Schmeling met for the first match in 1936, James Braddock held the title and Schmeling was ranked as the #2 contender, in line for a shot at the title held by Braddock. However, because Louis was so revered in the US, few (if any) truly believed that Schmeling would be a real threat to Louis. Maybe because Louis knew this, or maybe because he felt Schmeling was nonthreatening himself, he did not prepare for the fight with the intensity one would expect when readying to face the #2 contender for the Heavyweight Championship.

Before the fight Schmeling said, quoting loosely, "I see something." Though he would not tell what it was that he saw, he believed it to be a flaw in the technique of Louis that he could exploit. Obviously, watching the fight footage, he was right!

When the fight was underway, Schmeling was able to hit Louis with the straight right cross way too often. Schmeling's right became an offensive weapon for which Louis could find no good defensive answer.

Finally, in round 12, Schmeling landed a right cross to the body followed by another to the chin, sending Louis down and out, leaving fans stunned.

However, Louis trained for revenge with a vigor and, in 1938, stepped into the ring with Schmeling for a second time. This time Louis was ready! He won the rematch in the very first round by technical knockout after sending Schmeling to the canvas 3 times!

Eventually, the two formed a friendship outside of the ring that lasted right up until Louis' death in 1981, where Schmeling was a pallbearer at Louis' funeral.

Seems like Two whole questions. I'd suggest one ask 1st where can they get Kick Boxing Classes /question, alone. But, this may or may not be useful to all young boys, and girls. Otis Grant in Montreal, Canada has an Open world Webb site and he owns a boxing gym in Montreal. I've seen questions from young persons posted there, in past.

short answer: Yes, Ruiz beat Holyfield for the WBA title.

Long Answer:

After Lennox Lewis defeated Evander Holyfield for the Undisputed (i.e., WBC + IBF + WBA) World Heavyweight Championship in late 1999, the WBA mysteriously ordered Lewis to defend the title against obscure Don King fighter Ruiz, their #1-ranked contender, but Lewis refused. Though he had been undefeated since a loss against David Tua in 1996, the level of competition Ruiz had been facing was suspect and the only name he had beaten was a nearly 40 year old Tony Tucker.

Ruiz and his management sued, claiming that WBA rules entitled him to a title shot. A judge agreed, but rather than face Ruiz in a bout that was seen as commercially unattractive, Lewis instead fought Michael Grant, considered to be a very worthy contender at the time having knocked out a series of recognized 'name' opponents on HBO. After learning of this, the judge decreed that upon entering the ring against Grant on April 29, 2000, Lewis would automatically forfeit the WBA Title.

Ruiz fought former champion Holyfield to fill the vacancy on August 12, 2000, losing by unanimous decision (this result made Holyfield the first to win a world heavyweight title on four separate occasions). Many observers and boxing reporters felt that the underdog Ruiz had done enough to win.

Due to this controversial decision, the WBA ordered an immediate rematch in early 2001, and Ruiz won the WBA Championship in a slightly less-close unanimous decision - controversial as Ruiz had been decked by a Holyfield body shot and rolled around on the floor holding his groin for over a minute. The replay shows that the blow was a legal bodyshot, not remotely near Ruiz's crotch, and should have been scored a KO10 victory for Holyfield.