A unitary exercise device that provides exercise of the core muscles and legs of a user over a full range of motion in performing various physical activities by providing simultaneous counter-balancing tension to the core muscles and legs of the user as he is engaged in performance of the selected physical activity. The exercise device comprises a waist loop, left and right thigh loops, left and right rear and front straps, all of which are elastic materials heat-fused or sewn together to provide an exercise device specifically designed for a specific user. When worn by a user, the elastic rear and front straps of the exercise device provide counter-balancing tension to various muscle groups and legs of the user, dependent on the physical activity being performed, which over time with repetitive use and practice will provide improved performance or rehabilitation to the user when performing subsequently without the exercise device.

A control method for a motion evaluation system including a sensor attached at a predetermined wearing position below a knee of a subject, and a server device that generates an evaluation report based on a detection result of the sensor, the method includes a first step of causing the sensor to detect motion information indicating a motion below the knee of the subject, a second step of causing the sensor to transmit the motion information to the server device, a third step of causing the server device to acquire length information based on a height of the subject, a fourth step of causing the server device to estimate a movement of a foot of the subject from the received motion information and the acquired length information, and a fifth step of causing the server device to perform an evaluation on the estimated movement of the foot.