The most common and most likely answer to this crossword clue is the 3 plus 3 letter word TAI CHI
I've seen this crossword clue in The Guardian
T
A
I
C
H
I
More clues leading to the result TAI CHI
- Co-ordinated defence system to follow incomplete letter
- Start to train first person in Berlin in excellent exercises
- A slow system of exercises? Excellent champion in it making a comeback
- Spooner’s leafy herbal beverage is a Chinese art form
- Meditative practice from Asian country sounded almost fashionable
- Exercise and hot drink proposed by Spooner
- . Martial art found in 50% of Taiwan and large part of China
- Chinese system a bind, said Greek character
- Stripping off, stay and pick this exercise form
- Spies returning to hotel smuggled in titanium artform
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 = tai chi.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.