When tired of the crawl style revert to breaststroke for a time while, in general, it is always less fatiguing to swim on your back, as you then do not have to raise your mouth out of the water for every breath intake.
Xa udiniwe luhlobo lokuqubha tshintsha udade ngesifuba okwexeshana jikelele, isoloko kudina kancinci ukuqubha ngomqolo ngenxa yokuba ungakwazi ukuphakamisa umlomo wakho ngaphandle kwamanzi ukuthatha umoya