Note: The form 'gymnastic' is used as a modifier.
1.
Gymnastics consists of physical exercises that develop your strength, co-ordination, and ease of movement.
...the British Amateur Gymnastics Association.
N-UNCOUNT
2.
Gymnastic is used to describe things relating to ~.
...gymnastic exercises.
ADJ: ADJ n
3.
You can use ~ to refer to activities which require skills such as speed and adaptability.
Hers is the kind of voice that excels at vocal ~...
N-UNCOUNT: adj N