Amy felt a huge sense of pride when she received a card from a transplant patient who had benefitted from her stem cell donation.
The card said he was doing well, and for Amy, the knowledge she had helped improved someone's life motivated her to keep on helping.
Ride London is a huge challenge for Amy, but carrying the patient's card round the 100-mile course will keep her focused on why she decided to take part in the sportive.
Raising money for Anthony Nolan - a charity she has been linked with since joining their donor register in 2009 - will hopefully help more people in desperate need of stem cell donations.
The Ride London event takes place over three days from 28 to 30 July. You can find details of the BBC's live coverage of the event here, while the BBC Sport website will feature live text commentary of the Ride London 100 and 46 races and the men's elite London-Surrey Classic from 09:00 BST on Sunday.
And if you're inspired to try cycling yourself, check out our Get Inspired guide.