The sensors are designed to measure the strength of the pelvic floor muscle.
However, movements from the abs and thighs typically influence the size of the vulva and could thus increase vaginal pressure on the sensor.
To minimize this interference the sensors are pressure insensitive at the top and at the base.
Our sensors are also shorter than most vaginal sensors. This design helps to make sure the abs are relaxed: if the abs are involuntarily contracted the sensor tends to push out.
This happens frequently when people start to exercise, because it is difficult at first to control the pelvic floor without flexing the abs.
We recommend holding the sensor in place with one hand and placing the other hand on the abs to check if the abs are really completely relaxed, if this problem persists.