Hi Ali
I was wondering if you can tell me how long you have been practicing and how frequently. This may give us some ideas to work with for both elbow and foot problems.
Sore elbows (particularly in locust) is quite a common issue with many practitioners especially towards the beginning of their practice.
Foot cramping can be happening because as you learn balance and hopefully good overall ankle/knee/hip alignment that you are actively using muscles through the center of your foot to keep your ankle (and your arch) from collapsing. Does it sound like this could be happening for you?
Get back to me with more information and we can work it through together.
Namaste
Gabrielle 🙂