pull back
brace
strengthen, tone, tone up
tread
tense
to tense (gloss)
to tension (gloss)
(ux)
to flex (gloss)
to feel excited, nervous, antsy, jittery; to feel unsure or enthusiastic and a mild fear connected to it
to (make) feel excited, nervous, antsy, jittery; to (make) feel unsure or enthusiastic and a mild fear connected to it