Sufferfest makes my turbo go walkies - how do I stop it?

I downloaded Sufferfest Downward Spiral and did just the first set of intervals*. While I was giving it some welly, my turbo (a Minoura Hypermag) crept forward a few inches, to the stage where my front wheel was almost off the support. I had to stop, and move the support back under the wheel, which was pretty annoying!
I currently have the turbo and bike set up on a thick exercise mat. I'm thinking of changing this to a thinner rubber mat to see if that helps (it needs to be on some kind of mat to protect the carpet underneath). Will that help keep the turbo in its place? Any other ideas how I can stop the turbo moving forward?
* I'm only a beginner, and even that one set of intervals seems to have aggravated my hamstring!
I currently have the turbo and bike set up on a thick exercise mat. I'm thinking of changing this to a thinner rubber mat to see if that helps (it needs to be on some kind of mat to protect the carpet underneath). Will that help keep the turbo in its place? Any other ideas how I can stop the turbo moving forward?
* I'm only a beginner, and even that one set of intervals seems to have aggravated my hamstring!
http://app.strava.com/athletes/287459
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club
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it's a hard life if you don't weaken.
1, Get some pies down you for more weight.
2 Concentrate on your form on the bike and stop bouncing about
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club
That is certainly an area I need to work on. I gather that one-legged drills are useful for this, so I'll try some of these in the near future.
Member of http://www.UKnetrunner.co.UK - the greatest online affiliated running club
I do these fairly regularly, when I started I was amazed at how difficult they are! If you have a look on www.turbotraining.com there are some one legged sessions on there, doing 1 minute of alternative legs at 70 rpm. You will certainly feel it!
Try:
http://www.turbotraining.co.uk/
Great random link, though!