Archups without partner

Is there a way to do archups without having to buy anything or have a partner?
 

There are official gymnasticbody straps that attach to stall bars. You can find them here:http://www.gymnasticbodies.com/shop/gb-gear/back-strap/

The back strap is meant for archups. If you dont wanna pay for it then a high enough chair is suitable against a bar or something you can put your feet under.

If you have rings the straps from those should work, assuming you have a table or something you can lash yourself to.

don't quite get that bipocni

If you have a sturdy table, you can loop the rings straps around the table. Then climb onto the table so that your legs/hips are on the tabletop and your torso is hanging off the side. Slip your feet under the straps, and you're ready to do arch-ups. 

Thanks! Do you have a video of archups with good form? I'm confused about what they should look like.

Yes, in Foundations One

One of those GHD / sit-up machines should also do the trick