General Precautions and Procedures
Observe your partner's gait. If you notice any signs of instability, be extra-vigilant when he or she is moving about.
Use the "talk test." As a rule of thumb, make sure your partner can talk to you comfortably during any exercise. As long as conversation is possible, the danger of over-exertion or fatigue is minimal.
If using machines, establish and record seat adjustments and starting weight levels during the first two orientation visits.
Have subjects drink water at regular intervals and rest between sets and activities. Make sure that there is a restroom close by, since participants who drink extra fluids may require more frequent trips to the restroom.