From Adrian Ellis
You reported how Yong-Lae Park at Carnegie Mellon University in Pennsylvania made a robotic device with artificial muscles that could help people with cerebral palsy strengthen their foot and ankle muscles (25 January, p 21).
There may be another use: helping ordinary people develop a muscular body without having to pump iron. In the future, someone may simply climb inside a full-body version and develop a bodybuilder physique without having to lift a finger.
Hampton, Middlesex, UK
