This translates into the muscles, and tendons, working in their full ROM, in this case with an external weight; so it is of utmost importance to properly warm-up and progressively increase the workload using soft, fluid and low impact (not jerky) motions.
So what is a proper warm-up in preparation for Meel swinging? The answer can vary based on the practitioners age, condition level and health; but I'll elaborate more on the Pahlavani way!
In Persian Yoga (Pahlavani), particularly in the Zurkhaneh (House of Power) where Persian Yoga is practiced, there are a lot of ancient customs and traditions which cover many technical aspects of the art and that also address the motor mechanics required to practice the art and stay injury free. After all a Pahlavan (athlete, martial artist, physical culturist) needs to be in top shape and his/her conditioning should not produce injuries it should heal them.
Persian Yoga can be a very challenging form of physical exercise; the body is constantly moving, the joints are worked in their full range of motion (ROM), and muscles are worked and stretched in parallel. So after a general mobilization of the joints a Pahlavan (Persian Yoga practitioner) proceeds to dynamic stretching and calisthenics on the Shena, followed by even more dynamic stretching, prior to even picking up the Meel.
Doing dynamic stretching and calisthenics on the Shena internally rotates the shoulder joint while allowing a deeper extension at the shoulder joint and fully flexing and extending the elbow joint, hence producing a deeper muscle stretch and work. This is important as you are doing more work while reducing the stress on the shoulder (compared to doing pushups with your elbows pointing out i.e external rotation) and really condition all the structures of the upper limbs preparing them for the heavier work with the Meels as external load.
If you have swung Meels you know through personal experience of the powerful pull and stretch that is produced in the backward swing (or normal swing) on the triceps and shoulder girdle muscles and their tendons. This can potentially be deleterious for those structures if they are not ready to receive the work...and as we age we need to do more work before we do more work!
So take care of yourself, do your pushups, and be tireless.