An exercise apparatus, comprising: a platform having an endless belt mounted on the platform for allowing a user to run on the belt, the belt being driven by running movement of the user and defining an exercising space above the belt; a left side frame located at left side of the exercising space; a right side frame located at right side of the exercising space; and a restricting device (50, 450, 550) having a retaining portion (56, 456, 555), a left restricting portion (57, 457, 551), and a right restricting portion (58, 458, 552), the left restricting portion (57, 457, 551) secured to the left side frame, the right restricting portion (58, 458, 552) secured to the right side frame, the retaining portion (56, 456, 555) being located at a corresponding height of waist of the user so that the retaining portion (56, 456, 555) substantially abuts against waist of the user for resisting forward motion of the user within the exercising space; a left rear holding portion located at a left rear portion of the exercising space; a right rear holding portion located at a right rear portion of the exercising space wherein the retaining portion (56, 456, 555) is generally V-shaped, the left and right restricting portions (57, 457, 551, 58, 458, 552) extending from the retaining portion (56, 456, 555) to the left and right rear holding portions (24, 34), respectively, to secure the left and right restricting portions (57, 457, 551, 58, 458, 552) to the left and right side frames (20, 30), respectively; characterised by an entrance defined at the rear of the exercise apparatus for allowing the user to enter into or exit out the exercising space, the restricting device (50, 450, 550) forming an opening toward the entrance; a front frame having at least one front holding portion located at front side of the exercising space; a suspension portion coupled between the front holding portion and the retaining portion (56, 456, 555). a platform having an endless belt mounted on the platform for allowing a user to run on the belt, the belt being driven by running movement of the user and defining an exercising space above the belt; a left side frame located at left side of the exercising space; a right side frame located at right side of the exercising space; and a restricting device (50, 450, 550) having a retaining portion (56, 456, 555), a left restricting portion (57, 457, 551), and a right restricting portion (58, 458, 552), the left restricting portion (57, 457, 551) secured to the left side frame, the right restricting portion (58, 458, 552) secured to the right side frame, the retaining portion (56, 456, 555) being located at a corresponding height of waist of the user so that the retaining portion (56, 456, 555) substantially abuts against waist of the user for resisting forward motion of the user within the exercising space; a left rear holding portion located at a left rear portion of the exercising space; a right rear holding portion located at a right rear portion of the exercising space wherein the retaining portion (56, 456, 555) is generally V-shaped, the left and right restricting portions (57, 457, 551, 58, 458, 552) extending from the retaining portion (56, 456, 555) to the left and right rear holding portions (24, 34), respectively, to secure the left and right restricting portions (57, 457, 551, 58, 458, 552) to the left and right side frames (20, 30), respectively; characterised by an entrance defined at the rear of the exercise apparatus for allowing the user to enter into or exit out the exercising space, the restricting device (50, 450, 550) forming an opening toward the entrance; a front frame having at least one front holding portion located at front side of the exercising space; a suspension portion coupled between the front holding portion and the retaining portion (56, 456, 555).