We made the measurements always at the same time before the workout. I used a handheld bioelectrical impedance device to measure BF% and BMI. I tried the device on myself and it worked accurate. My client is 66 years old and diabetic. She always eats the same food and has an eating routine to avoid complications with her diabetic. She started working out with me 3 month ago and we meet once a week for a resistance trainings session (mainly tubing, balance and coordination exercises). Other than that she is walking daily with her dog. So, except seeing me once a week no changes in her routine. I’m worried that it might be a medical issue and appreciate your reply, thank you!