1. Do the exercises slowly, surely and smoothly. Avoid doing abrupt movements so as not to strain your muscles.2. When doing the exercises, make your you execute them properly. For example, when lifting weights, lift them all the way up and all the way down.3. Use spotters for support and to avoid accidents.
skeletal system and the muscular system,
Muscles are attached to the skeleton and work assuming that the skeleton is there; for example, there is no muscle that makes sure you don't bend the middle of your arm, as it's stable because there is a bone in it. Basically, the skeleton is a scaffolding for the muscles.
the skeletal system and the nervous system,
Many nerves run along the skeleton, or even inside the bones, and the bones protect the nerves; for example in the spinal cord
the muscular system and the nervous system.
The Nervous system controls the muscles; it sends the muscles commands
