Usain Bolt achieved many victories during his illustrious career as a sprinter, and the Jamaican star is working to add post-goal celebrations to his repertoire.
It was labelled as Bolt's "trial" with the club, though there have been doubts whether that's genuinely the case or nothing more than a marketing stunt from Dortmund's point of view.
While some of Dortmund's bigger names are away with their national teams, there were still plenty of stars on show, and it was World Cup victor Mario Gotze who set up Bolt's best moment.
The fastest man alive, who previous year retired from athletics, reiterated his desire to play football professionally. I want to play, but it has to be in the top league. "It's something I said to him, and he said, 'If you're serious, we'll see what happens, ' so let's see what happens [this week]".
"If they tell me I'm good enough and need a bit of training, then I'll do it".
The training was live streamed and even open to some of the public.
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He also nutmegged a BVB youngster, which you've got to think was pretty embarrassing for the lad.
The Jamaican told reporters Dortmund were incredibly welcoming and that it was "overwhelming" to train in a stadium that can hold up to 81,000 people.
"They wanted to but I thought it was too cold".
"I don't set any standards, I don't know where I am at".
Former Olympic champion Bolt is edging closer to realising his dream of playing for Manchester United after being managed by Jose Mourinho in a legends match. He will captain the Soccer Aid World XI in a match to raise funds for the United Nations Children's Fund.