He said he'll be bike... and he is.
Former California governor Arnold Schwarzenegger sampled the Barclays "Boris" Bikes on the Southbank last year, and now the Terminator has gone cycling once again. He Tweeted on Sunday that they were the best way to see the capital.
Arnie praised the bike hire scheme back in March 2011, saying: "The 6,000 bikes you have here in London are a fantastic idea. The bike rides really well, it is solid, it burns calories so you can eat a few extra wiener schnitzel and you get away with it," he said.
It looks like he's in the capital to support Team USA, who are currently leading the medal table with a whopping 44 golds. American actress Jamie Alexander tweeted she'd seen him at a dinner using the hashtag #USAOlympics.