DS,your reference to Geoff Hunt and his training is something that many tennis players would never do. Serena is probably the laziest trainer around but getting stronger as she gets over 31. Her regimen,Pilates 2 or 3 times a week and when she's training for a tournament,a couple of hours of hitting, then an hour of two of of cardio and strengthening in the gym. And when she's home in LA she runs half a mile up the hill to Venus's house instead of driving. A few Ped's might help as well. Just waiting for the next embolism. Ferrer won also. Hooray for 30 year olds and and their training routines.
