Provided are apparatuses for augmenting human speed, human-driven compliant mechanisms, artificial limbs to augment human movement, and the like. The apparatuses can include variable stiffness mechanisms including springs that can be configured to selectively store and subsequently release energy generated by human movement. The apparatuses can selectively release the captured energy supplied by the human to provide force and power output beyond the physical capability of the human.

Systems and methods for electronically conducting a fitness activity challenge are disclosed. The method may include first collecting electronic fitness data related to a first fitness activity, collecting second electronic fitness data related to a second fitness activity, generating comparison data by comparing the first electronic fitness data and the second electronic fitness data, and displaying the comparison data.

Athletic performance sensing and/or tracking systems include components for measuring or sensing athletic performance data and/or for storing and/or displaying desired information associated with the athletic performance to the user (or others). Such systems can allow users a wide variety of options in creating workouts, selecting and presenting media content during the athletic performance, etc., e.g., to help keep users entertained and motivated. In some instances, user feedback may be used, optionally in combination with objective data relating to a workout, to control features of the workout routine, to control the music or other media content selected and/or presented, and/or to control features of future workout routines and/or the presented media content.

An article of footwear includes an upper member and a sole structure, with a sensor system connected to the sole structure. The sensor system includes a plurality of sensors that are configured for detecting forces exerted by a user's foot on the sensor. The sensor system also includes a port that is configured to receive a module to place the module in communication with the sensors. The port includes a housing with a chamber configured to receive the module and an interface engaged with the housing and having at least one electrical contact exposed to the chamber. Additional retaining structure and interface structure may be included.

An agility training ladder may include a plurality of frame bodies, and each of the frame bodies has a first board and a second board. Each of the first board and the second board has two connecting members respectively at two ends thereof. Each of the first boards comprises two first connecting ribs at two lateral surfaces thereof while each of the second boards has two second connecting ribs at two lateral surfaces thereof. Each of the connecting members comprises two third connecting ribs at two lateral surfaces thereof and two first connecting recesses at two ends thereof, and the first connecting recesses are communicated with the lateral surfaces of the connecting members. The first boards and the second boards are connected through the connecting members, and the first connecting recess is adapted to slide along to the first, second or third connecting rib.

A method of providing workout training for a user of an activity tracking system includes displaying a plurality of training plan options to the user on a screen of a personal electronic device, and then receiving a selected training plan option from the user. Selected workout day options are received from the user and the system generates a training schedule for the user based on the selected training plan and the selected workout day options. One or more reminders identify the type of workout for the scheduled day and an option to accept or reject the workout. When the user selects the option to accept the workout, the workout goal associated with the scheduled workout is displayed. The method further includes determining progress toward the workout goal based on the received workout data, and displaying an indicator of progress toward the workout goal on the screen during the workout.

Tracking and monitoring athletic activity offers individuals with additional motivation to continue such behavior. An individual may track his or her athletic activity by completing goals. These goals may be represented by real-world objects such as food items, landmarks, buildings, statues, other physical structures, toys and the like. Each object may correspond to an athletic activity goal and require an amount of athletic activity to complete the goal. For example, a donut goal object may correspond to an athletic activity goal of burning 350 calories. The user may progress from goal object to goal object. Goal objects may increase in difficulty (e.g., amount of athletic activity required) and might only be available for selection upon completing an immediately previous goal object, a number of goal objects, an amount of athletic activity and the like.

Hand held weight units of light weight manufactured as a solid unit, a shell unit with core insert combinations or modular units with interlocking ends. Shell units with core inserts and modular interlocking units allow for the changing of held weight by inserting or removing inserts or by locking or unlocking of modular weight unit sets creating varying held weight. The weight units are primarily used with upper body exercises during aerobic exercises in the home, outdoors, or in a gym setting such as walking or running to vary the intensity of workout during use.

A method, a false start detection system, and a false start detection sensor for determining whether an athlete has performed a false start in an event. Force data is received representing the force exerted by at least one upper appendage of the athlete on a surface when in a starting position (S701). The force data is processed to determine an athlete start time (S702), and the athlete start time is compared to an event start time to determine whether a false start has occurred (S703).

A adjustable workout sled bag in a closed configuration is to be used as a workout bag by one or more grips, fasteners, loops, woven tape and/or reinforcement positioned on the outer periphery of the adjustable workout sled bag. The adjustable workout sled bag with at least one dense surface to be used as a dragging tool with a harness, straps and other accessories to train for speed and VO2 a harness to be used as a separate tool, for speed and agility, strength, endurance, conditioning and to correct posture by uplifting the torso. The adjustable workout sled bag can be used as a backpack with a strap for resistance exercises or without harness. The adjustable workout sled bag comprising of at least one fastener to transition to an open configuration which includes at least one compartment, configured for enclosing one or more fillers and other objects is disclosed.