Paul Greenhaff is deputy director of the Medical Research Council (MRC)/Arthritis Research UK (ARUK) Centre for Musculoskeletal Ageing Research, and an active member of the ARUK Centre for Sport, Exercise and Osteoarthritis. Paul’s research interests are centred on the loss of muscle mass and the dysregulation of metabolism in immobilisation, inflammation, ageing and disease, and strategies (including exercise, nutrition and pharmacological interventions) to offset these effects.