keep ones nose grindstone (verb) keep one's nose to the grindstone: work doggedly
Sinonime: active,
animated,
beating, bouncing, bounding,
buoyant,
dynamic, hopping, hurdling,
irregular, leaping,
lively, pulsating, quaking, quivering, shaking, skipping, springing, throbbing, trembling, unsteady,
vibrant