Sian uses a net
Here's a brief description of the contestant's attempt. Someone's probably working writing up more detail!
Sian accidentally chose her ball before reading the task by touching the rubber band ball. After initially trying to just bounce the ball into the bin (including attempts to catapult it from a net), she put the ball in the net and 'bounced' it up and down on the ground 112 times before dropping it into the bin.
(Written by Taskmaster Wiki contributors)