You will need:
2" x 12' foot lashing straps (Harbor Freight Tools: $3.99)
2 rolls of 244 lb capacity nylon rope (Harbor Freight Tools: $1.49)
2x 1.25" x 60" pvc pipe (Lowes: $1.50 each)
Aluminum foil and a large cookie sheet
an old fish pail
Gorilla Glue Tape
Step 1: Cutting the PVC to Size and Prepping It
Step 2: Pour in the Sand
Step 3: Cooking the Pipe
Step 4: Cleaning and Cutting the Pipe Sections
Step 5: Tying the Knot, Finishing Up
Start by threading the rope through the pipe sections, until it goes through at least three times. Then get two equal sections, one in each hand, put your foot on the ring, and pull those rope sections until all of it is super tight.
Now for the snake roll knot. You have two ends that should come out facing each other: one should go one way, and should go the opposite way (if one side is on the left, the other piece of rope should be on the right). they both coil around the rope three or four times, depending on how much space is available. Then you tie a square knot in the middle, left over right, then right over left. Pull it tight, then stick the extra ends of rope in the ends of the pipe sectionals.
After the knot is tied, take some gorilla strength glue tape and cover the rope section, so that it doesn't come undone. Now put the lashing straps through it, like in the cover picture on the instructable, and start doing simple workouts like pushups and dips. Gymnasticbodies.com is a great website for rings exercises.
That's all, and I'd like to thank catmanducmu and his instructable, https://www.instructables.com/id/How-to-make-PVC-gymnastic-fitness-rings/, for inspiring me to make my own changes. On that note, the only p[roblem I've experienced is that after 6 months, the lashing straps metal piece tends to break, so you ultimately have to tie it together in a general square knot, and that should hold just fine.]