be, keep, etc. in trim

be in trim

To be in good health and physical shape. Primarily heard in UK. I've been going to the gym so that I'm in trim for my island vacation.
See also: trim

keep in trim

To maintain good health and physical shape. Primarily heard in UK. I've been going to the gym to keep in trim for my island vacation.
See also: keep, trim

be, keep, etc. in ˈtrim

(British English, informal) be, remain, etc. fit and healthy: For a man of his age he keeps in good trim. OPPOSITE: be out of shape (2)
See also: trim