The 24-year-old mid-fielder suffered a cardiac arrest during a football match against Tottenham Hotspur in March. However he was saved by a defibrillator, but later had to retire on medical grounds.
As a result, Muamba has been supporting the Hearts & Goals campaign, aimed at placing 500 defibrillators in public places and schools around the UK.
It was one of the first machines they used on me when I was on the floor [...] As small as it is, it is very powerful, trust me, it is very, very powerful.
For the first of two special reports, ITV News reporter Lewis Vaughan Jones has spoken to the retired player about his latest goal: