1. fit
  2. as fit as a fiddle
  3. at home
  4. up to the mark
  5. hard as nails
fit as a fiddle
physical fitness
to be in the pink of condition Fiil
to be in good shape Fiil
to be up to the mark Fiil
to be on the game Fiil
to be up to scratch Fiil
to be in pretty good shape Fiil
to be at one's best Fiil
to feel not quite the thing Fiil
to be off one's game Fiil
to be off form Fiil
to be not up to the mark Fiil
to not to be in form Fiil
to be on top of one's form Fiil
to be off one's oat Fiil
to not to feel quite up to the mark Fiil
to have someone by the short hairs Fiil
to keep the body in tune Fiil
he is in form