Intervention: the exercise protocol is based on the PLIÉ protocol, which the investigators have developed in consultation with experts worldwide who have experience performing different types of exercises in individuals with mild-to-moderate dementia, including traditional strength-building exercises, yoga, Tai Chi and Feldenkrais. Specifically, investigators have identified exercises from each of these traditions that engage the muscles most needed to maintain independence--including lower body strength (to help with getting out of bed/chair), balance (to minimize risk of falls), upper body strength (to help with lifting), fine motor exercises (to help with activities such as eating and brushing teeth), and pelvic floor exercises (to help with continence)--and have combined them into a unique integrative exercise program. These exercises are designed to be purposeful (i.e., to achieve a goal) and to build procedural ('muscle') memory. In addition, breathing and guided meditation exercises are included to promote relaxation and well-being.