The Pelvexiser > IQ design allows the user to regulate pressure in the resistance sensor with one hand. (The air pressure knob has to be firmly shut.)

The pressure in the sensor can be increased with the palm of the hand.

The pressure release button can be pushed with the index to decrease pressure in the sensor, while the bulb can be squeezed with the lower three fingers (see picture). This is espescially helpful since most users find it comfortable to use one hand to hold the sensor in place.