The most common and most likely answer to this crossword clue is the 4 plus 3 letter word KEEP FIT
I've seen this crossword clue in The Daily Telegraph
K
E
E
P
F
I
T
More clues leading to the result KEEP FIT
- Reinforced building before attack: a healthy practice
- Exercises in part of castle, one featuring in paper
- Look up suitable exercises
- Continue to have loud rumpy-pumpy exercises
- Part of castle suitable for exercises?
- Part of castle appropriate for exercises
- Exercise equipment separated by European fellow holding record
- Hold suitable programme of exercises
Buddy explains!

The straight part
We know that "exercises" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case exercises = keep fit.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.