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I try to challenge myself as much as possible, as often as possible.

I am tough but I have a soft side.

I like to challenge myself.

If the material is challenging, it forces you to challenge yourself when handling it.

The will to challenge myself is strong, but I think that's growing, the desire to stretch myself and make it hard.

I love to challenge myself.

Nobody challenges me. I challenge myself.

It's nice to be able to do more and to always challenge myself.

I definitely challenge people. But hopefully, I am working harder than anybody else, and so people won't resent the fact that I want them to work hard, as well.

Once in a while it's good to challenge yourself in a way that's really daunting.