The most common and most likely answer to this crossword clue is the 7 letter word JOGGING
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More clues leading to the result JOGGING
Buddy explains!

The straight part
We know that "Stimulating/exercise" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stimulating/exercise = jogging.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.
What does JOGGING mean?
JOGGING noun- The action of the verb to jog.
- The practice of running at a relatively slow pace for exercise.
- To push slightly; to move or shake with a push or jerk, as to gain the attention of; to jolt.
- To shake, stir or rouse.
- To walk or ride forward with a jolting pace; to move at a heavy pace, trudge; to move on or along.
- (exercise) To move at a pace between walking and running, to run at a leisurely pace.
- To cause to move at an energetic trot.
- To straighten stacks of paper by lightly tapping against a flat surface.