Regular watchers of Cristiano Ronaldo will have noted that he isn't quite as explosive across the turf as he once was.
But that's hardly surprising at 34 year old.
That's not to say he's a slouch; Ronaldo certainly keeps apace with players younger than him, and is showing no sign of letting up in his quest for perfection.
Having had a few weeks relaxing in some of Europe's finest locations, the Juventus striker has been working on his speed ahead of the new season - with some help from an expert.
Ronaldo posted a video to his Instagram account training with Nigeria-born Portuguese athlete Francis Obikwelu.
"It was a great experience to train with my friend @francisobikwelu on track," Ronaldo wrote in the caption. Obikwelu returned the compliment on his own page, writing: "It was a pleasure to train with my good friend @cristiano."
Obikwelu specialised in the 100m and 200m, and was a silver medalist at the 2004 Athens OlympicsGames.
He clocked 9.86 seconds in the Athens 100m final, which is still a European record, although it has been matched twice since by Frenchman Jimmy Vicaut. It was the first medal in an athletics sprinting event for Portugal.
He also won the 100m and 200m gold at the 2006 European Championships.
Ronaldo didn't make the top five fastest players list in the Champions League last season.
Leading up to the final between Liverpool and Tottenham Hotspur, Liverpool's Virgil van Dijk was officially the fastest in the competition, having clocked 34.5kph against Barcelona.
He was closely followed by Manchester City's Leroy Sane (34.4kph), Nemanja Radonjic of Crvena Zvezda (34.2kph), Kyle Walker of Manchester City (34.2kph) and Real Madrid's Gareth Bale (33.8kph).
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Footballers on holiday:
