Jack Brockway / Virgin.com

Ever the competitors, Obama and Branson threw down the gauntlet the ex-president would learn to kite surf and mogul would master the foilboard (a surfboard with a hydrofoil that allows riders to glide over the water).

"We agreed to have a final-day battle to see who could stay up the longest," Branson wrote.

Branson admitted they both struggled to get the hang of their respective sports. And on the appointed day, the adventurous Brit said he was feeling good when he managed to ride his foilboard for about 50 meters, some three feet above the water.

"I was feeling very pleased with myself, only to look over and see Barack go 100 meters on his kiteboard!" Branson wrote. "I had to doff my cap to him and celebrate his victory."

PHOTOS -

Jack Brockway / Virgin.com

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Obama Kite Surfs With Richard Branson in Virgin Islands Holiday - NBCNews.com