(figuratively) to run out of steam, to lose one's momentum, to slow down, to languish, to mark time

(informal, figuratively) to take the plunge

(figuratively) to give way, to yield [+ à (object) = to]

(figuratively) fast, quickly

no problem!

silently, stealthily, on tiptoe

to quicken one's pace, to pick up the pace, to walk faster, to speed up, to hurry up, to get a move on

(informal) like no one else, like you've never seen before; as can be

like no other

to lengthen one's stride, to walk faster