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This is advertising art for the Muhammad Ali-George Foreman bout in Zaire, 1974. (AP Photo) ( Ali Foreman Ad 1974 )

Muhammad Ali shows off his new horse at the opening of his training camp on July 17, 1974 in Deer Lake, Pa. in preparation for his championship fight with George Foreman in September in Zaire, Africa. In top right photo the horse rears away from Ali as he was leading it away and in bottom photo Ali mockingly makes a fist at the horse in jest for rearing away. Ali plans to ride the horse as part of his training. (AP Photo/ Paul Vathis) ( Muhammad Ali )

George Foreman, the heavyweight champion of the world, is interviewed at Pleasanton, California on August 2, 1974 when he opened his training camp where he'll prepare for his on September 24 title defense against Muhammad Ali in Africa. Aides expected Foreman to train for about a month in California before leaving for Africa. (AP Photo/SJV) ( George Foreman Professiona Boxer Close Up Wearing Cap )

Heavyweight champion George Foreman winds up a right as he works out on the heavy bag on August 7, 1974 at his training camp at the Alameda County Fairgrounds in Pleasanton, California. That?s trainer Dick Sadler hanging onto the bag. Foreman is in training for a defense of his title against Muhammad Ali in September. The fight will be in Africa. (AP Photo/Robert Houston) ( George Foreman )

This is a general view of the central market place on August 27, 1974 in Kinshasa, the capital city of the African nation of Zaire. Kinshasa will be the scene for the upcoming bout between world heavyweight boxing champion George Foreman and challenger Muhammad Ali. The fight scheduled for September 1974 had to be rescheduled to October 30, 1974 after Foreman needed to recover from an eye injury during training. (AP Photo) ( Zaire Kinshasa )

Zaire dancer with spear moves ahead of Muhammad Ali through welcoming crowded at Kinshasa airport, September 10, 1974. Ali arrived in a chartered Air Zaire plane from Paris for the world championship fight with George Foreman. AP Photo/ Horst Faas) ( Muhammad Ali Zaire )

Heavyweight contender Muhammad Ali plays the bongos with "Big Black" at a gym in the N'Sele training center in Zaire, Oct. 5, 1974. Ali is training for a bout with George Foreman. (AP Photo/Horst Faas) ( ALI IN ZAIRE 1974 )

Workers are busy with preparations on August 12, 1974 at the main entrance of the May 20 Stadium in Kinshasa, Zaire for the world heavyweight championship scheduled for Sept. 24th between George Foreman and Muhammad Ali. The stadium, with a capacity of 62,800 is being almost entirely rebuilt. The fight had to be rescheduled to October 30, 1974 after Foreman needed to recover from an eye injury during his training. (AP Photo) ( Zaire Kinshasa )

Boxer Muhammad Ali on a sightseeing tour downtown Kinshasa, Zaire September 17, 1974. Ali is scheduled to meet opponent George Foreman on Sept. 24, but the fight had to be delayed until October 30, 1974 because a Foreman injury. (AP Photo) ( Muhammad Ali Zaire )

World heavyweight champion George Foreman, right, relaxes with friends at a Zaire hotel, Sept. 20, 1974. At left is singer James Brown. The women, who did promotional work for the Foreman-Muhammad Ali fight, are, from left, Veronica Porche, Vickie King and Trina Booker, all from Los Angeles. (AP Photo/Horst Faas) ( George Foreman And Friends 1974 )

Muhammad Ali, due to fight George Foreman, world heavyweight champion, Sept. 24, 1974 in Kinshasa, Zaire, tells a crowd of boxing fans in N' Sele, Thursday, Sept. 12, 1974 "Ako bo mai ye," which translates from Zaire's Lingalla dialect as: "I will kill him." The fight had to be rescheduled to October 29, 1974 after Foreman needed to recover from an eye injury. (AP Photo/Horst Faas) ( Muhammad Ali Zaire )

Muhammad Ali, right, boxes with sparring partner Larry Holmes during his first workout at the N'Sele , Zaire training camp Wednesday , September 11, 1974 in preparation for his Sept. 24. Title bout with heavyweight champion George Foreman. Ali boxed six rounds. The September match was rescheduled for October 29, 1974 to allow George Foreman to recover from an eye injury. (AP Photo/Horst Faas) ( Muhammad Ali Zaire )

Muhammad Ali and official read scales during weighing on Saturday, Oct.26, 1974 at stadium in Kinshasa for his fight against heavyweight champion George Foreman in Kinshasa on October 30. At left is Don King one of the promoters of the fight. Directly behind scales is Angelo Dundee, Ali?s trainer. Other is Drew Bundini, also a trainer. (AP Photo) ( Muhammad Ali in Zaire )

George Foreman, world heavyweight champion, stands in the ring at his training camp in N?Sele, Zaire, on Monday, Sept. 30, 1974 as he resumed workouts two weeks after he suffered the cut over his right eye that delayed his fight with Muhammad Ali. Foreman shadowboxed for five rounds and exercised with the speedbag. (AP Photo/Horst Faas) ( George Foreman )

This photo diagram comparing boxers Muhammad Ali and George Foreman is for use as desired with stories on Tuesday's heavyweight championship fight in Zaire, October 1974. (AP Photo) ( FOREMAN VS. ALI )

Heavyweight champion George Foreman raises both fists in salute to crowd during opening ceremonies Sunday at the arena in Zaire where he and challenger Muhammad Ali will meet for the world heavyweight crown Oct. 30. Foreman took his jacket off while walking around the infield of the stadium. (AP Photo/Horst Faas) ( FOREMAN IN ZAIRE )

The opening ceremony of the national anthem is shown in Kinshasa Stadium, Zaire, Africa, October 30, 1974, prior to the world heavyweight championship bout between George Foreman and challenger Muhammad Ali. George Foreman is alongside the ropes in a red robe. Ali is fourth from the right, partially obscured. (AP Photo) ( ALI FOREMAN )

Boxer Muhammad Ali winces as he takes a George Foreman left to the jaw in fifth round of their heavyweight championship bout in Kinshasa, Zaire, October 30, 1974. Referee Zack Clayton watches. Ali knocked out Foreman in the eighth round to regain the title. (AP Photo/Ed Kolenovsky) ( Ali Foreman Zaire )

Challenger Muhammad Ali winces as he is hit with a powerful left jab to the body by defending world champion George Foreman in their WBA/WBC championship bout in Kinshasa, Zaire, on October 30, 1974. Ali regained the heavyweight crown by knocking out Foreman in the eighth round of the fight dubbed 'Rumble in the Jungle.' (AP Photo) ( ALI VS FOREMAN KINSHASA )

An exhausted Muhammad Ali falls to the canvas after knocking out defending champion George Forman and regaining the world heavyweight title in Kinshasa, Zaire, Oct. 30, 1974. Ali knocked out Foreman in the eighth to regain the world heavyweight title. (AP Photo) ( HEAVYWEIGHT FOREMAN ALI )

Perspiration flies from the head of George Foreman as he takes a right from challenger Muhammad Ali in the seventh round in the match dubbed Rumble in the Jungle in Kinshasa, Zaire, Oct. 30, 1974. Foreman was knocked out in the eighth round. The referee, left, is Zack Clayton. (AP Photo/Ed Kolenovsky) ( ZAIRE HEAVYWEIGHT FOREMAN ALI )

Challenger Muhammad Ali watches as defending world champion George Foreman goes down to the canvas in the eighth round of their WBA/WBC championship match in Kinshasa, Zaire, on October 30, 1974. Foreman is counted out by the referee and Ali regains the world heavyweight crown by KO in the bout dubbed 'Rumble in the Jungle.' (AP Photo) ( ALI VS FOREMAN KINSHASA )

FILE - In this Oct. 30, 1974 file photo, referee Zack Clayton, right, steps in after challenger Muhammad Ali looks on after knocking down defending heavyweight champion George Foreman in the eighth round of their championship bout in Kinshasa, Zaire. Ali regained the world heavyweight crown by knockout in the eighth round of the fight dubbed "Rumble in the Jungle." (AP Photo/File) ( Rumble In the Jungle Boxing )

Muhammad Ali, arms raised in victory, walks to his corner as referee Zack Clayton counts out George Foreman after Ali knocked him down in the eighth round of their title bout in Kinshasa, Zaire, Oct. 29, 1974. (AP Photo) ( ALI FOREMAN )

Challenger Muhammad Ali raises his arms in victory after defending champion George Foreman is counted out by referee Zack Clayton, ending the WBA/WBC championship bout in Kinshasa, Zaire, on October 30, 1974. Ali regains the crown as the undisputed heavyweight world champion by KO in the eighth round of their fight dubbed 'Rumble in the Jungle.' (AP Photo) ( ALI VS FOREMAN KINSHASA )

Muhammad Ali waves to a chanting crowd at Kinshasa's N'Djili airport in Zaire, Nov. 1, 1974, as he boards a plane to return to the United States. (AP Photo) ( RUMBLE IN THE JUNGLE )