Sitima yofewa, yokhazikika komanso yoletsa kutchinjiriza: yabwino kwa oyamba kumene, Takweza bolodi lokhala ndi inflatable iyi yokhala ndi nsonga Yofewa yomwe imalepheretsa kugwa kwanu pakatsika kapena ngozi.
Zimachitika kwa abwino kwambiri aife, kotero zitha kukhala okonzeka

Ma board onse amabwera ali ndi zonse zomwe mungafune kuti mutuluke ndikusangalala ndi madzi nthawi yomweyo.