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UFC legend Randy Couture has suffered a heart attack on and is currently in intensive care in hospital, according to reports.

The 56-year-old reportedly walked himself to the hospital on Wednesday after falling ill while working out at the Unbreakable MMA gym in LA.

He was rushed into intensive care were he remains undergoing treatment.

TMZ reports the three-time heavyweight champion is expected to make a full recovery.

Known as The Natural, he is considered done of the greatest MMA fighters of all-time.

In his prime he defeated fighters such as Chuck Liddell, Tito Ortiz, Vitor Belfort and more.

Couture competed in a record 16 title fights, and holds the record for most wins in matches for the UFC Heavyweight Championships. He is also the only person over the age of 40 to have won a UFC championship match – having done so four times. The legend is a three-time UFC Heavyweight Champion, a two UFC Light Heavyweight Champion and an interim UFC Light Heavyweight Champion. The 6ft 1in and 93kg fighter also won the UFC 13 Heavyweight Tournament.