Depends on the client and their goal.
For weight loss I usually have them on a treadmill or elliptical for 10 easy minutes. Its a quick way to get the blood flowing and catch up with them.
For mass gain I take them through dynamic stretches and light weight bearing exercises.
If its an athlete then I take them through a sports specific program.
Hi Mac. A simple yet good general warm-up that I use for my general clients is a 3-5 minute bike ride or a lap around the track if we’re outdoors. I usually follow that up with some basic dynamic stretches.
Foir my athletes, it’s a much more comprehensive warm-up (e.g. low level plyos, basic reaction drills, more detailed dynamic stretching etc.).
I hope that this helps.