You also need to arrive fit and rested as you will be pushed hard mentally and physically all week. The fitter you are the more you will get out of the coaching holiday, people often use this as a spur to take their fitness and power to weight ratios to new found levels! If you want to have a two week holiday, it is probably best to book it so that your first week is the clinic, so you are fresh.
Lastly, you will really be one step ahead if you have as much knowledge of Jem's highly acclaimed Vimeo channel . You can also achieve some amazing results if you really visualise the skills you are looking to achieve and mentally rehearse them. Jem wants you to get the absolute max out of his coaching holidays and sees them as a big investment in your windsurfing, so please invest in your preparation and reap the rewards!
All my clinic locations are absolutely awesome - if your not sure get in touch!