上半

jiā kuài zì jǐ de bù fá fǒu zé nín huì zài bǐ sài de shàng bàn chǎng gǎn dào pí juàn

加快自己的步伐，否则您会在比赛的上半场感到疲倦。

Pace yourself or you'll tire yourself out in the first half of the race.