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While serving as a Royal Marine in Afghanistan in 2009, Andy was caught up in an explosion.
Speaking to LADbible, he explained: "I suffered 27 separate injuries in the blast and although everything healed okay to a point, I was having major problems with my right lower leg.
"I couldn't run, play football, climb mountains - basically do all the things I loved doing.
"I opted to have the leg amputated below the knee in the hope I would have a better quality of life."
Instead of his Liverpool FC tattoo, which once read 'You'll Never Walk Alone', the surgeon had to cut off the last word, meaning he was left with the tattoo reading 'You'll Never Walk'.
"When I woke from the operation to see the tattoo, I just laughed," Andy said. "I was more relieved that everything had gone well and I could move on with my life.
"It's just become a funny story now that I can share."
This year marks 10 years since Andy had his life-changing operation, and he's since gone on to become a motivational speaker and written a book, he even broke a world record.
He said: "I've been lucky enough to work with Liverpool Football Club as well as the England football team, so when I share my story that bit always gets a good laugh, especially in football circles!
"It has also given me the title for my autobiography, You'll Never Walk, which was published after I became the fastest single leg amputee in the world with a time of 37:17 over 10km."
As 2019 marked 10 years since Afghanistan, inspirational Andy decided to launch a podcast his podcast, Leg It.
Andy explained: "From footballer Jamie Carragher and comedian John Bishop to stunt woman Eunice Huthart - I have invited them all on.
"It's a podcast with a variety of guests from entrepreneurs to undercover cops, adventurers, extremists and everyone in between."
You can listen to Andy on the Leg It podcast here.
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