Nineteen months ago he was close to death with all four limbs amputated to save his life after a terrible infection overwhelmed his body.
Now Alex Lewis from North Hampshire is not only learning to walk again, but he's planning to cycle, swim and even do a skydive.
But the hardest battle Alex faces is raising enough money to pay for artificial limbs he needs. The very best prosthetics aren't available on the NHS and the cost over his lifetime is likely to be two and a half million pounds.
Kerry Swain has been back to meet Alex at a private rehabilitation centre in Buckinghamshire which is designing special arms and legs for him. This is her exclusive report.