“Essential” elements that I would consider would be caridovascular training (both steady-state and interval) and a lot of flexibility work. Additionally, I would emphasis lower body strength work (e.g. squats, lunges, single-leg squats and presses). Lastly, I would perform a number of body weight exercises to enhance the ability to handle your own body weight as well as balance work to enhance proprioception.
I hope that this helps.