An exercise device is described which includes a platform having a first end and a second end opposite the first end; first and second wheels, wherein the first wheel is positioned proximate the first end and the second wheel is positioned proximate the second end and the first and second wheels are configured to roll across a surface as the exercise device is displaced along the surface; a first motor configured to apply a first torque to the first wheel where the magnitude of the first torque is related to the distance of the exercise device from a zero position and the direction of the first torque urges movement of the exercise device toward the zero position. Versions are also described with more wheels and more motors.

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 exercise device is described. An exercise device includes a body, the body having a top, a bottom, a first end located at one edge of the body, a second end located at an opposite edge of the body, and first and second sides extending between the first and second ends; one or more wheels; and an energy storage device applying resistive and restoring force to the one or more wheels. Optionally, a shaft can be present that rotationally locks two or more of the wheels.

A pivot board exercise device has a top circular part may rotate in relation to a bottom circular part, and a unique unibody or complex multi-arm resistance mechanism is secured at its center to a rotational center platform of the top circular part, and is secured at the end of each arm to posts projecting from the bottom circular part. The unibody multi-arm resistance mechanism is a single piece of resilient/flexible material, the complex multi-arm resistance mechanism has multiple arms attached at the ends to the bottom part, so when the top of the invention is rotated relative to the bottom, resistance is offered, the resistance increasing with rotation and occurring regardless of the direction of rotation.

A method for treating pronator syndrome involves selecting an arm and positioning it with the forearm perpendicular to the upper arm. The hand of the arm is engaged with a grip located inside a bisected working circle, which has an outer perimeter consisting of four quadrants. The fourth quadrant is elliptical and asymmetrical to the others. The grip is designed for hand engagement and includes two d-shaped slots. A resistance band is attached to the body, with one end in the groove, creating tension when used. To exercise the arm, the body is rotated in one direction to increase tension on the band. Releasing tension is achieved by rotating the body in the opposite direction.

An ankle exercise device comprises a base frame, a heel rest, a rotational component, and a plurality of resistance bands. The resistance bands may be connected to the rotational component. The rotational component rotates 90 degrees to orient the resistance bands in either a horizontal or vertical direction. The heel rest may comprise a u-shaped cutout to cup a user's heel. The heel rest is adjustable to align the heads of a user's metatarsals between the resistance bands. With the resistance bands in the horizontal direction, the user may rotate the ankle in the plantarflexion and dorsiflexion directions. With the resistance bands in the vertical direction, the user may rotate the ankle in the inversion and eversion directions.

Disclosed is a bi-directional resistance exercise machine. The bi-directional resistance exercise machine is comprised of two flywheels that provide constant and variable resistance against the movement of a trolley during a push or pull movement. The bi-directional resistance allows a user to work antagonistic muscles in an efficient manner and in one single machine. Accordingly, the present invention provides resistance against a user while pulling a trolley along a track to work the core, legs, back, and biceps, and resistance against a user while pushing a trolley along a track to work the core, chest, triceps, and shoulders.

An exercise bar assembly includes a pair of rotating grip assemblies, each including a generally planar frame and a hand grip mounted within the frame for rotation within in the plane of the frame. The rotating grip assemblies are attachable to opposite ends of a center bar assembly along the longitudinal axis of the bar assembly. A plate bar assembly is attachable to each of the rotating grip assemblies opposite the center rod, with the plate bar assembly aligned with the longitudinal axis to form a weight lifting bar. A user-selectable elastic band is engageable between the pair of rotating grip assemblies along the longitudinal axis so that the elastic band resists rotation of each hand grip in each of the rotating grip assemblies. The rotating grip assemblies of the exercise bar assembly allow for the full range of motion of the bicep, and the elastic band creates a resistance exercise through the bicep's full range of motion.

A method for treating pronator syndrome involves selecting an arm and positioning it with the forearm perpendicular to the upper arm. The hand of the arm is engaged with a grip located inside a bisected working circle, which has an outer perimeter consisting of four quadrants. The fourth quadrant is elliptical and asymmetrical to the others. The grip is designed for hand engagement and includes two d-shaped slots. A resistance band is attached to the body, with one end in the groove, creating tension when used. To exercise the arm, the body is rotated in one direction to increase tension on the band. Releasing tension is achieved by rotating the body in the opposite direction.

The invention relates to the field of therapeutic-athletic exercise apparatus. The claimed exercise apparatus comprises a vertical guide rail that has a support for sliding. Disposed on the guide rail are: a movable horizontal crossbar which is connected to a pivoting roller unit and to fasteners for cables, and can be moved along the length of the guide rail and fastened in various positions, and which also has places for attaching athletic accessories; a pull-up bar mounted at the top, having a place for attaching athletic accessories and having guide rollers for cables; a pivoting arm connected through its axis of rotation to the lower part of the vertical guide rail such that the arm is capable of both pivoting and being fastened in various positions, moreover, mounted on the end of the arm is a horizontal crossbar having a place for fastening athletic accessories and having guide rollers for cables. The claimed exercise apparatus is suitable for both general exercises and for therapeutic purposes related to posture correction, thus making the exercise apparatus universal.