Trampolining in tennis refers to the effect created when a player hits a flat shot using a racket strung with very loose tension.
This technique causes the ball to compress deeply into the string bed before rebounding with increased velocity. The looser strings act like a mini-trampoline, generating additional power and speed that can catch opponents off guard.
Professional players occasionally use this effect strategically, though it can reduce control and consistency. Modern racket technology has made trampolining effects more pronounced, leading some manufacturers to recommend specific string tensions to balance power and control.