How can I make a swing in to a glider?

Cindy Rubin
by Cindy Rubin

This HUGE 'porch' swing has great sentimental value for my husband and I... long story. I wanted to make an A frame for it in the yard to swing on it. I think I've changed my mind.

Can I make this bench 'swing' into a glider? I know somebody out there in DIY land knows... please share with me.

It weighs approximately 100 pounds.