estaban rebotando
-they/you were bouncing
Imperfect progressive ellos/ellas/ustedes conjugation of rebotar.

rebotar

Iban disparados a tal velocidad que en diez minutos estaban rebotando por la orilla del lago hacia el centro de Armonía Social en Cherry Beach.
They rocketed downtown so fast that they were there in ten minutes, bounding along the lakeshore toward the Social Harmony center out on Cherry Beach.
Word of the Day
to skate