You might try that, yeah..
After that though, if this goes well, you should definitely add more repetitions. 3x5 isnt all that much. 3x10 might be better, after that 15x etc.
Also, you might try doing 'survivalrun training' wich is basically an 'every-muscle-in-your-body' sport
It's running, combined with obstacles. Ofcourse you cant build them yourself, but be creative. Try climbing under a bridge without touching the ground (only at the base so you wont fall in the water, unless you like that
), climb trees up and down a couple of times, or just hug a tree at a certain height and dont let go, do push-ups, pull yourself up to branches, hang upside down on branches and do sit-ups, rope-climbing, try taking a backpack with weights etc etc...
It's a great sport, when you do an official survivalrun you WILL feel every muscle in your body afterwards
I do them for school occasionally, also for fun. Last time when i was finished i could barely tie my shoelaces the day after, cause my arms where that exhausted.
http://www.youtube.com/watch?v=PmwEAaSTQsA&feature=related example movie of what i mean.
You could take elements out of this and use them, it's really an all-in sport.
Usually they are around 13 kilometres long and have around 50 obstacles, in january though there is gonna be the mother of all survivalruns, Beltrum =D Wich will be 20 km long with even more obstacles, it's a *****
http://www.survideo.nl/index.php?option=com_content&task=view&id=3&Itemid=4 This is just some of the first 20 obstacles, as you can see obstacle 8 is allready one big mother of an obstacle
