What stops you from sinning in heaven?

[Drich]

I was just wondering, from a Christian point of view, what stops the Christian from sinning in heaven? Do you not have free will anymore when you get there?

Short answer is no.

(I'm assuming of course that no one in heaven will ever sin which is what I think most Christians think)

The "Heavenly" experience is divided into two distinct time periods pre and post millennial reign. Pre millennial is where even boarder line Christians live under Christ. At the end of this reign Satan will be loosed again to harvest those find themselves discontented living under the reign or rule of Christ. After this final rebellion and the final judgement those left will live in the expressed will of God.
Rev 20

I think I remember from my days as a Christian learning about how Christians will get a "new body" in the afterlife. Is this what keeps you from sinning in heaven?

Apparently for the first 1000 or so years just the novelty of being in Heaven.

If so, this would seem to imply that it's our current bodies that causes us to sin. Assuming this is true, it seems that it would have been better for God to give all men better bodies.

"we" started out with perfect ones.

Also, what sort of body did Adam and Eve sport? Was it the same sort of body that Christians get in the afterlife?

bible does not say.

But in any case, assuming that no one in heaven will ever sin, what stops a person from sinning in heaven?

We elect to live in the Expressed will of God.