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.

A device including a frame, that is designed to be attached to a stationary structure element, at least one member for applying the forces produced by the patient, mounted on the frame and free to rotate about an axis of rotation that is fixed relative to the frame, a force sensor that measures, in a direction radial to the axis of rotation, the traction component of the forces applied to the member, and an angle sensor that measures the angular positioning of the member about the axis of rotation.

A magnetron mechanism of an unpowered treadmill contains: a driving body, a one-way transmission element, and a magnetron mechanism. The driving body includes a frame, a connection fence, a front wheel assembly, and a connection shaft. The one-way transmission element is mounted on the connection fence of the frame. The magnetron mechanism is fixed on the connection fence and includes a rotary shaft, a drive wheel, a driven wheel, a belt, a flywheel, a resistance element, and an adjustment unit. The resistance element has a pair of fixing sheets and multiple magnetic parts. Each of the multiple magnetic parts has a rotatable connection portion. The adjustment unit has a steel cable, an end of which is connected with the resistance element so that the steel cable pulls the resistance element to swing along the rotatable connection portion.

Disclosed herein is exercise equipment for strengthening the pelvis, by which the exercise effect of enabling the pelvis, the genitourinary sphincter inside the pelvic cavity, etc. to be strongly contacted and relaxed may be obtained during the exercise of collecting and spreading the knees. The exercise equipment includes: grip parts (110); cylindrical insertion/separation pipes (120); cylindrical support pipes (130); packing parts (140); cylindrical cushion parts (150); side fastening U-shaped plates (160); fastening plate supports (170); a side support connection bar (180); and fastening belts (200). Rotating grips (190) are attached to the bottoms of coupling bolts (B), respectively, by which the side support connection bar (180) connects and fastens the side fastening U-shaped plate supports (170), and the side support connection bar (180) is fastened to the bottom of the cushion part of a chair by using the two fastening belts (200) and coupling bolts (B).

An exercise machine has a resistance mechanism that is movable with respect to a stationary frame into and between a rest position and an active position and a pulley system coupled to the resistance mechanism and being operable by a user performing an exercise motion. Operation of the pulley system moves the resistance mechanism from the rest position to the active position, against a resistance force from the resistance mechanism. Releasing the pulley system allows the resistance force to automatically move the resistance mechanism back towards the rest position. A dampening device has an inertial switch that causes the dampening device to automatically dampen movement of the resistance mechanism from the active position towards the rest position when the pulley system is suddenly released.

A Pilates chair exercise apparatus has a frame configured to rest on a horizontal surface, an inverted Y shaped seat support member fastened to an upper portion of the frame, a seat fastened to an upper end of the seat support, and a pair of parallel arms each having a proximal end fastened to the frame and a foot support fastened to a distal end of the arm, wherein each arm is biased away from the frame. A rotary torque unit mounted to the frame beneath the seat biases each of the arms. The rotary torque unit includes a rotary spring cassette that carries a plurality of flat coil springs each having only one end fastened to an axle at one end of one of the arms. Combinations of the springs in the spring cassette may be user selected without the user leaving the seat of the chair exercise apparatus.

The present invention relates to a novel treadmill with a practical hand-powered system to replace electric motor for driving the tread belt. The hand-powered system includes fixed range movement of both handles, cranks coupling system for two handles, and cyclic spring or magnetic energy store and release system to help pass each handle's dead spot. Handle's pivotal and reciprocal movement can be smoothly and efficiently converted to tread belt's movement.

An exercise device includes a strap. The strap includes a first surface and a second surface opposite the first surface. The strap is configured to be secured to a lower leg of a user such that the first surface of the strap interfaces with the lower leg of the user. The exercise device further includes a ball including an outer surface configured to be held by the user, a first connector extending from the ball, a second connector extending from the second surface of the strap, and a tension member. The tension member includes a first coupling mechanism and a second coupling mechanism at opposite ends thereof and configured to be releasably coupled to the first connector and the second connector via the first and second coupling mechanisms.

An exercise device includes a strap. The strap includes a first surface and a second surface opposite the first surface. The strap is configured to be secured to a lower leg of a user such that the first surface of the strap interfaces with the lower leg of the user. The exercise device further includes a ball including an outer surface configured to be held by the user, a first connector extending from the ball, a second connector extending from the second surface of the strap, and a tension member. The tension member includes a first coupling mechanism and a second coupling mechanism at opposite ends thereof and configured to be releasably coupled to the first connector and the second connector via the first and second coupling mechanisms.

An upper body exercising device attaches to and is used in conjunction with a stationary bicycle having a seat tube. The upper body exercising device includes a pair of resistance mechanisms, and a clamping mechanism. The pair of resistance mechanisms are disposed on opposite sides of the clamping mechanism, respectively, and provide resistance for a user. The clamping mechanism attaches to the seat tube of the stationary bicycle so as to attach the upper body exercising device to and use in conjunction with the stationary bicycle.