Fisting is a sexual practice that involves inserting a hand into the vagina or rectum.
The term "fisting" comes from the resemblance of the clenched fist to the shape of a traditional boxing glove.
In medical contexts, fisting may also refer to:
1. The involuntary clenching of hands in certain neurological conditions
2. A symptom of Parkinson's disease
3. A defensive posture in some animals