An apparatus includes a rolling mechanism and a pulley device. The rolling mechanism is connected to a cable and configured to traverse the cable from a first end of the cable toward a second end of the cable, the cable being attached to and extending between a pair of support members. The pulley device is removably coupled to the rolling mechanism and attached to a tackling bag, the tackling bag being configured to be tackled when propelled from the one of the pair of support members toward the other of the pair of support members. The pulley device is separated from the cable when the tackling bag is propelled from the one of the pair of support members toward the other of the pair of support members.

An apparatus includes a rolling mechanism and a pulley device. The rolling mechanism is connected to a cable and configured to traverse the cable from a first end of the cable toward a second end of the cable, the cable being attached to and extending between a pair of support members. The pulley device is removably coupled to the rolling mechanism and attached to a tackling bag, the tackling bag being configured to be tackled when propelled from the one of the pair of support members toward the other of the pair of support members. The pulley device is separated from the cable when the tackling bag is propelled from the one of the pair of support members toward the other of the pair of support members.

A martial arts training device including a support frame, a first central pad, and a second central pad. The first central pad is supported from the support frame and includes a convex surface for receiving punches and the second central pad is supported from the support frame below the first central pad and also includes a convex surface for receiving punches. The convex surface of the first central pad is tilted downwardly relative to the convex surface of the second central pad.

Training accessories and methods for improving athletic techniques, such as, for example, tackling form for football. A display can be coupled to a piece of athletic equipment, such as a tackling dummy, and the display depicts a symbol at a time at which a player is or is about to interact with the equipment or perform a movement or action. An input is provided of the player's identification of the depicted symbol and compared to the symbol that was actually depicted. The player's correct identification of the depicted symbol can indicate that the player performed the movement or action, or the interaction with the equipment, with appropriate form. A player's failure to correctly identify the depicted symbol can indicate to a coach that the player may need further instruction on proper technique or form with which the movement or action, or the interaction with the equipment, should be performed.

A weight sled that allows both linear and non-linear movements such that resistance training can be performed in the frontal, sagittal, and combined frontal/sagittal planes, and which allows easy movement for transportation, storage, and retrieval from storage. The weight sled uses one or more swiveling, pivoting, or omni-directional wheels that allow all or a portion of the sled to be moved laterally. The addition of wheel configurations allowing of lateral movement of all of, or a portion of, the weight sled greatly expands the utility of weight sleds because movement in any direction can be trained, whether in the sagittal body plane (forward/backward movements), the frontal body plane (lateral movements), or a combination of the two. Additionally, the plurality of wheel configurations allows for a variety of storage arrangements.

A tackle training apparatus includes a padded body member and two padded elongate leg members in which each leg member has a first end for abutting the body member and a second end for contacting the ground. The two leg members are arranged in relation to the body member to extend from and to be resiliently movable relative to and/or separable from the body member, and in one configuration where the second end of each of the two leg members is placed on the ground, the two leg members can support the body member such that the apparatus is in a standing position, provides an effective training apparatus for improvements in collisions and especially tackles in rugby. Use of the apparatus facilitates improvement in point of contact, height of approach, grip technique and grip strength.

A tackle training apparatus includes a padded body member and two padded elongate leg members in which each leg member has a first end for abutting the body member and a second end for contacting the ground. The two leg members are arranged in relation to the body member to extend from and to be resiliently movable relative to and/or separable from the body member, and in one configuration where the second end of each of the two leg members is placed on the ground, the two leg members can support the body member such that the apparatus is in a standing position, provides an effective training apparatus for improvements in collisions and especially tackles in rugby. Use of the apparatus facilitates improvement in point of contact, height of approach, grip technique and grip strength.

Methods and systems according to embodiments of the invention provide for a framework for privacy-preserving machine learning which can be used to obtain solutions for training linear regression, logistic regression and neural network models. Embodiments of the invention are in a three-server model, wherein data owners secret-share their data among three servers who train and evaluate models on the joint data using three-party computation (3PC). Embodiments of the invention provide for efficient conversions between arithmetic, binary, and Yao 3PC, as well as techniques for fixed-point multiplication and truncation of shared decimal values. Embodiments also provide customized protocols for evaluating polynomial piecewise functions and a three-party oblivious transfer protocol.

An apparatus includes a pair of support members, a cable, a rolling mechanism, a tackling bag and a pulley device. The pair of support members are fixedly coupled to a surface. The cable is attached to and extends between the pair of support members. The rolling mechanism is connected to the cable and configured to traverse the cable from a first end of the cable toward a second end of the cable. The tackling bag is attached to the rolling mechanism and configured to be propelled from one of the pair of support members toward the other of the pair of support members. The pulley device is coupled to the rolling mechanism and attached to the tackling bag. The pulley device is separated from the cable when the tackling bag is propelled from the one of the pair of support members toward the other of the pair of support members.

An apparatus includes a pair of support members, a cable, a rolling mechanism, a tackling bag and a pulley device. The pair of support members are fixedly coupled to a surface. The cable is attached to and extends between the pair of support members. The rolling mechanism is connected to the cable and configured to traverse the cable from a first end of the cable toward a second end of the cable. The tackling bag is attached to the rolling mechanism and configured to be propelled from one of the pair of support members toward the other of the pair of support members. The pulley device is coupled to the rolling mechanism and attached to the tackling bag. The pulley device is separated from the cable when the tackling bag is propelled from the one of the pair of support members toward the other of the pair of support members.