Captain Neil Rudd in British Forces Germany is running hundreds of miles this year for Duchenne UK, a charity that is close to his heart.
Neil's former Queen's Royal Hussars colleague Marc Clark has a young son who was diagnosed with Duchenne Muscular Dystrophy in 2015.
Jack's parents noticed that he seemed to take longer than others to get up from the floor, so mentioned it to their son's doctor.
After blood tests he was diagnosed with Duchenne Muscular Dystrophy – a muscle wastage disease which has no cure.
He will soon need walking aids and later will have to use a wheelchair and may develop heart problems.
Fitting in training around his British Army job, Neil raised £5,000 for them last year and is aiming to try and match that again this year by doing a number of personal challenges, including three marathons.
He has already taken part in the Hermannslauf run, and the 100km London to Brighton Ultramarathon.
*You can donate by texting RUDD75 and the amount you want to give to 70070*