text: how can an older male boost his metabolism if exercise is restricted by doctor's orders?   great luck ,older one... restrictions aside, the grazing is good, and the bigger muscles pump the metabolism for a longer time period than aerobics...,gluets ,thighs,back and chest...slowly.. 2 seconds each way.. lite weights..  do twenty reps, if you can't do twenty,lessen the load..  oh yeah , keep breathing. and praying.