A system for providing resistance in an exercise machine. The system includes a motor, at least one loop drive attached to the motor. A carriage is coupled to the loop drive. The carriage moves in a first direction when the motor is turned in a first direction and a second direction when the motor is turned in a second direction. At least one sensor is attached to the carriage, wherein the at least one sensor is configured to detect external force on the carriage. Information from the sensor indicates external force on the carriage. The information is used to determine a movement of the carriage in response to the external force. The motor is instructed to turn the loop drive to apply the movement.

An exercise machine may include a support frame; at least one weight rack configured to receive added weight; and a weight ratio arrangement engaged with the support frame, the at least one weight rack, and a first attachment. The weight ratio arrangement may include an exercise cable having a first end connected to the first attachment and a second end connected to a portion of the machine; at least two movable pulley blocks, each including at least one pulley, wherein the at least one weight rack is attached to and configured to move with one of the at least two movable pulley blocks; and a locking mechanism movable between a locked position in which only one movable pulley block is movable and an unlocked position in which the two movable pulley blocks are movable. The exercise cable may be operatively connected to the at least two movable pulley blocks.

A bi-directional exercise machine has a work arm, first and second cams coupled to the work arm, a resistance mechanism, and a pulley assembly that couples the resistance mechanism to the work arm via the first and second cams so that movement of the work arm is resisted by the resistance mechanism according to first and second resistance profiles provided by the first and second cams, respectfully. The pulley assembly has a primary pulley cable having a first end coupled to the first cam and a second end coupled to the second cam. When the work arm is in a rest position the first and second ends of the primary pulley cable both extend from cable tracks of the first and second cams, respectively, at a tangent, and in particular so that the resistance mechanism applies a resistance force on the work arm via the pulley assembly immediately upon movement of the work arm out of the rest position.

A door mount system for securing exercise devices to a door for use by a user. The door mount system includes a support member, a securing member, an attachment member, and an adjustment member. The adjustment member is adapted to move the securing member. A securing member is adapted to press on the door to removably connect the support member to the door. The attachment member is adapted to connect to an exercise device. The door mount system may further include guide members and slots. The guide members slidably move in the slots to prevent rotation of the securing member. The attachment member may include one or more eyelets adapted to connect to the exercise device.

An adjustable carriage assembly is configured to be mounted on a frame member of a weight rack and includes a locking structure for locking the carriage assembly in place on the frame member. The carriage assembly may include a moveable carriage with a plurality of rollers that engage the frame member, as well as one or more handles for gripping to adjust the position of the carriage assembly and a connection structure for connection of an implement or accessory. Various implements and accessories can be connected to or used in connection with the carriage assembly, including various weightlifting implements and accessories that are pivotably connected to the carriage assembly.

A weight arm assembly for use with a weight lifting rack is provided, the weight arm assembly including a mounting bracket configured to be attached to a vertical surface in a fixed position, an arm mount configured to be coupled to the mounting bracket so as to be pivotable about a first axis, a stop member coupled to the arm mount and configured to move between an engaged position to prevent pivoting of the arm mount through interaction with the mounting bracket, and a disengaged position to allow pivoting of the arm mount, and a weight arm configured to be coupled to the arm mount, proximate a first end of the weight arm, so as to be pivotable about a second axis substantially orthogonal to the first axis.

An apparatus having a first sliding member having an outer wall surface and an inner wall surface defining a central opening. A second sliding member having an outer wall surface and that is configured for sliding insertion into the central opening of the first sliding member. A space is formed between first and second sliding members. The first sliding member slides and may be fixed at a selected location along the length of the second sliding member. The apparatus includes a slider insert having a center section and a pair of lips that engage the first sliding member for removably mounting the slider insert to the first sliding member such that the slider insert is located in the space between the first sliding member and the second sliding member. The slider insert slides with the first sliding member and prevents the first and second sliding members from contacting on another.

A weightlifting machine that includes a pulley system and a cable system that attaches to a weight rack frame to allow a user to perform a weightlifting exercise. The pulley system may include a first pulley and a second pulley where the cable system engages each pulley. The cable system may have a first end connected to a grip attachment and a second end attached to a resistance element. The resistance element may include a resistance band, a weight support that holds a weight plate, a set of weight plates, or other type of resistance element. The cable system may extend from the pulley through an opening located one of the frame members that form the frame. A seat attachment assembly may also be connected to the weightlifting machine, where the weightlifting machine may include a pulley rotatably connected to a seat base that supports a seat. In addition, a foot rest attachment assembly may be connected to the weightlifting machine, where the foot rest attachment assembly may include an adjustable foot rest.

The present invention is a free weight belt squat machine that allows a free, unencumbered raising and lowering of variable resistance by a user. A belt which is directly attached to the horizontal free weight bar holds standard Olympic plates and may be raised or lowered, directly in free space, by the user. Thus, the natural and optimal movement pattern of a straight line over the user's center of gravity may be fully and completely realized. This machine provides a control arm to safely and effectively engage and disengage the resistance from the machine to the user and then back to the machine. This machine further provides an adjustable stopper mechanism for the safety of the user and to limit or expand the range of the exercise to cause the desired adaptations in muscular strength and size.

A jump box for training athletes that eliminates a lot of the hazards of using a traditional jump box. The device has a base, a back frame and a platform the height of which can be adjusted in small increments. The platform is sized and shaped to extend further towards the athlete than any other portion of the jump box making it considerably safer than other devices on the market. In addition, the platform of the jump box is angled downward slightly to make it easier for the athlete to jump on the device. The weight and construction of the device makes it virtually impossible to knock over. In addition, because of the shape and orientation of the platform, athletes can use the box without injuring themselves if they miss a jump.