Nyorai kupfuurira kweiyi ndima - Akarasikirwa nemwaka wa1975 asi akadzoka kuita chiito nekukunda zita reBelgian cross country ra1976. Akakundikana kudzokorora kubudirira kwake kwekare pa1976 IAAF World Cross Country Championships, achiuya wechi49, kunyange zvazvo Belgium yakatora menduru yesirivha. Shamwari yake yechikwata Léon Schots akahwina ndarama pa1977 IAAF World Cross Country Championships uye De Beck's 18th-place finish yakamuona achigovana mumutambo wechikwata kechitatu mubasa rake. Sezvo 1970s yakaswedera kumagumo, kuita kwechikwata cheBelgian kwakaderera: De Beck aive wechi26 pamakwikwi ese ari maviri muna 1978 na1979, neBelgium iri pachinzvimbo chechishanu mumakwikwi ese ari maviri. Pashure pokupotsa mwaka wa1980, akanga ari wechi64 bedzi muna 1981. Akanga ari mutambi akanakisisa wenyika yake paWorld Cross Country Championships muna 1982 na1983
, vachipedza vari 17 nguva imwe neimwe.