I am doing Tough Mudder in May and am keen to start training now. I run 5k in just under 30 mins but don't do it regularly. I currently do 2 insanity classes a week plus boot camp and body pump classes. I did Grit Plyo for the first time last week and would like to incorporate that and/or Grit Strength. I'll be doing some hill/trail running training with teammates once a week. Any Tough Mudders here who can advise what else to alter/incorporate? Also, conscious that I'm not really a runner at the moment, which running plan to follow - 10k or half marathon?