Abstract: In one embodiment, a manual CPR device, also known as a CPR derrick, includes a frame that is put close to a patient who is on the ground. The device also includes a piston that can be moved up and down, and is aligned to be over the patient's chest. The device also has an actuator that the rescuer can operate manually so as to move the piston up and down, which will deliver compressions to the patient's chest. A bottom stop prevents the compressions from being too deep. In some embodiments, proper dimensioning of the CPR derrick permits the rescuer to perform CPR chest compressions while standing up, i.e. without kneeling. The rescuer may be able to perform higher quality CPR, and for a longer time, giving more opportunity to a life-saving team to arrive in time.