slow runner; turtle runner
Jocular term for someone who runs very slowly, likening them to a turtle.
マラソン大会で、彼は自称「亀ランナー」だけど、最後まで完走した。
At the marathon, he called himself a 'turtle runner,' but he finished the whole race.
亀ランナーの私でも、ゆっくりなら楽しく走れる。
Even a slow runner like me can enjoy running if I take it easy.
Compound of 亀 (turtle) and ランナー (runner), a playful coinage likening a slow runner to a turtle.