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Sir Jim Ratcliffe could have been forgiven for feeling exhausted on Sunday night.

The 71-year-old ran the London Marathon before dashing to Wembley in time to catch the second half of the FA Cup semi-final between Manchester United and Coventry.

Ratcliffe, who bought a 25 percent stake in United earlier this year, arrived at Wembley with Erik ten Hag's men 2-0 up courtesy of goals from Scott McTominay and Harry Maguire.

Bruno Fernandes then added a third just before the hour mark to seemingly cement his team's spot in the FA Cup final.

But Ellis Simms and Callum O'Hare scored twice in eight minutes, before Haji Wright converted a 95th minute penalty to send the game to extra time.

And Coventry looked to have won an extraordinary contest as Victor Torp scored in the final minute of extra time, only for VAR to rule Wright had strayed offside in the build-up.

United eventually prevailed 4-2 on penalties to set up a repeat of last season's final against Manchester City next month.

If the London Marathon tested Ratcliffe's stamina, watching United's near-fatal capitulation at Wembley almost emptied his emotional reserves.

'There are some parallels [between football and running a marathon] I have to say, but it just requires some grit,' he told BBC Sport after crossing the line on Sunday.

'Running a marathon after 30 kilometres [18 miles] is difficult.'

The challenge has never put Ratcliffe off. The INEOS boss - Britain's second-richest man with an estimated fortune of £29.7billion, according to last year's Sunday Times' Rich List - takes his fitness as seriously as his business.

A keen runner, Ratcliffe has completed over 30 marathons in his life.

On Sunday, the Failsworth-born billionaire finished the London Marathon in four hours, 30 minutes and 52 seconds, a personal best over the 26.2 miles.

'At my age, that [time] is not bad,' was his modest assessment to the BBC after crossing the finish line on The Mall on Sunday. 

Ratcliffe shaved one minute and 55 seconds off his time 12 months ago, despite being hampered by a hamstring issue for the second consecutive year.

'I trained for London last year and I had a hamstring issue,' he told the Geraint Thomas' podcast in February. 

'I was out for five weeks and I didn't have much time to retrain. I went to Africa, it was quite warm and I had a go.

'It was okay. Exactly the same thing has happened this year.

'I've had five weeks out with a hamstring so I only started training a week ago for London. It's not very long. I need to get going.'

Ratcliffe hasn't limited himself to traditional marathons either. 

In 2013, he competed in the Marathon Des Sables - the Marathon of the Sands - a week-long ultramarathon.