Decleir was born in Belgium in 1971. He was a promising football player for former Belgian first division club, K.R.C. Harelbeke.[1] After a motorcycle accident in 1989, his left leg was amputated in 1995. Soon after Decleir started powerlifting and in 2000 he switched to handcycling.[1]
Decleir is married with two children and is a bank manager. In 2012, he made the national news headlines when his mistress was murdered by her husband.[2][3]