Screws for mounting exercise rings on concrete ceiling
There are two primary types of anchors for concrete. I'd trust either if properly installed. Holes must be drilled cleanly and to the proper size. Bolts must be of the correct diameter and length. Both require fairly large holes (7/16" to 5/8" or so).

Sleeve or Wedge Anchor (with integrated bolt)


Lag Shield (with standard lag screw)