I was wondering if there are some excercises I could do without a guitar. So i.e. in the car or waiting on the bus.

listen to music.
hearing excercises are good for your playing too.
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This thread is officially about sucking Sleaze off for a sig.

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Try exercise 3.

I always do it when i am in a bus and stuff like that.

Take all the permutations and play them

The vargrip is also a very good tool. It's definitely worth the investment