Heymans moved to Namibia in 1984 while the country was still controlled by his native South Africa. A rugby player until then, Heymans began cycling in 1987.
Heymans has represented Namibia numerous times, including at the 1991, 1995, 1999 and 2003 All-Africa Games. He also competed for his country at the 1994, 1998, 2002 and 2006 Commonwealth Games. As for the Summer Olympics, Heymans has participated in the 2000, 2004 and 2008 Summer Olympics. In the 2008 games, Heymans was the country's flag-bearer at the opening ceremonies.
|Flagbearer for Namibia
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