Lateral wall press (WP) exercise is one of the weight-bearing exercises of the gluteal muscle strengthening programs (Figure 1) (3). This exercise requires the hip on the weight-bearing side to maintain relative hip abduction despite the creation of an addiction torque by the opposite knee pushing laterally against the wall (14). O’Sullivan et al. (14) demonstrated that the lateral WP exercise is an effective isometric strengthening exercise for Gmed using EMG. However, little is known about the activity level of Gmax on the weight-bearing side during the lateral WP exercise. The primary actions of the Gmax muscle are hip extension and hip external rotation (17), and the superior area of the Gmax also functions as a hip abductor (22). We considered that the frontal WP exercise could require the hip on the weight-bearing side to maintain a relative hip extension despite the creation of a flexion torque by the right knee pushing forward against the wall (Figure 2). We hypothesized that not only lateral but also frontal WP exercise might induce high EMG activity in the Gmax.