You've stretched your trunk, now go the other way and strengthen your back too...

When you cycle, the posture you take over the bars pulls in and tightens the abdominals (even if it doesn't actually strengthen them!), but you never do the reverse movement, stretching out the back.

Road.cc's resident yoga expert Karen Burt shows you how to activate the muscles that run up the outside of the spine - and rest easy - this is exercise you can do lying down!

Last week we looked at the role of the trunk in Yoga for Cyclists part 10, and we'd urge you to do the two sets of exercises in tandem. Of course, the way we've arranged these videos means you can make your own compilation of exercises to give you a home workout that provides exactly the kind of benefits you personally need.

Here's how to open out and relax your back, to get the most out of your training:

>>Read more: Our full Yoga for Cyclists series.

After an unpromising start, having to be bribed by her parents to learn to ride without stabilisers, Sarah became rather keener on cycling in her university years, and was eventually persuaded to upgrade to proper road cycling by the prospect of a shiny red Italian bike, which she promptly destroyed by trapping a pair of knickers in the rear derailleur. Sarah writes about about cycling every weekend on road.cc.