Implementations described and claimed herein provide systems, apparatuses, and methods for providing cardiovascular exercise by simulating an exercise experience, such as a jump rope experience. In one implementation, a pair of exercise simulators is provided. Each of the exercise simulators includes a spin assembly rotationally mounted to a handle along an axis line. The spin assembly is configured to rotate about the axis line. At least one weight is housed in the spin assembly, and a light source is configured to rotate about the axis line with the spin assembly. The light source is configured to emit light to provide a visual representation of the motion of the spin assembly.

A rotation mechanism of a wrist exerciser is provided. The rotation mechanism includes a sleeve ring, a spinning mass, and a driving assembly. The sleeve ring is rotatable along an annular groove. The sleeve ring includes an annular body and a mount component. The annular body has a first mount portion and a first insertion hole respectively located at two opposite sides of the annular body. The mount component has a second mount portion and a second insertion hole. The second mount portion of the mount component is engaged with the first mount portion. Two shaft portions of the spinning mass are respectively and rotatably located in the first insertion hole and the second insertion hole, allowing the spinning mass to be rotatable. The driving assembly includes a stator fixed to the mount component and a rotor mounted on the spinning mass.

A rotation structure includes a main body, two bearings mounted in the main body, a mandrel mounted between the two bearings, a rotation member having a first end connected with the mandrel, and a weight mounted on a second end of the rotation member. The rotation member is situated at a center of the mandrel and is perpendicular to the mandrel. The rotation member and the weight have a total length smaller than a radius of the main body. Thus, the weight is rotated in the main body without producing sound so that the main body is operated in a noiseless manner and will not produce noise during movement.

A medicine ball has a gyroscope housed inside a rotatable capsule, a user interface configured to receive a user input, a programmable controller, and a power source each communicatively coupled with the user interface. In operation, the power source supplies power to the gyroscope, the rotatable capsule, and the programmable controller in response to receiving the user input at the user interface. The programmable controller controls the movement of the gyroscope and the rotatable capsule in response to receiving the user input at the user interface.

The present invention relates to improvements in or relating to tremor stabilisation apparatus and methods, in particular to gyroscopic devices for use in controlling tremors of parts of the body and for reducing effects of tremors on the human body. The apparatus includes a wearable element and at least one gyroscopic device mounted or mountable to the wearable element, the gyroscopic device including a gyroscope and a gyroscope housing. The at least one gyroscopic device may be mounted within the housing such that the gyroscope may precess with respect to the housing. The mount may include a hinge to which the gyroscope is mounted and a hinge plate or hinge mount to which the hinge is mounted for rotation with respect to the gyroscope housing, such as a turntable mounted to the gyroscope housing. The gyroscopic devices may include a control arrangement to control the precession of the gyroscope.

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 muscle training apparatus with muscle strength detecting function includes a first supporting shell, a plurality of membrane pressure-sensing units, an arithmetic processing unit and an elastic covering unit. The first support shell is spherical and has a first outer surface and a first containing space. The membrane pressure-sensing unit is disposed on the first outer surface of the first support shell. The arithmetic processing unit is disposed in the first containing space and electrically connected to the membrane pressure-sensing unit. The elastic covering unit covers the first support shell.

A muscle training apparatus capable of generating a force is disclosed. The muscle training apparatus includes a second support shell, a force-generating unit and an elastic covering unit. The second support shell is spherical and has a second containing space. The force-generating unit is disposed and fixed in the second containing space of the second supporting shell for generating a force. The elastic covering unit covers the second support shell to have a soft surface. The muscle training device can generate a force in a specific direction and intensity by the force-generating unit.

A rotation mechanism of a wrist exerciser is provided. The rotation mechanism includes a sleeve ring, a spinning mass, and a driving assembly. The sleeve ring is rotatable along an annular groove. The sleeve ring includes an annular body and a mount component. The annular body has a first mount portion and a first insertion hole respectively located at two opposite sides of the annular body. The mount component has a second mount portion and a second insertion hole. The second mount portion of the mount component is engaged with the first mount portion. Two shaft portions of the spinning mass are respectively and rotatably located in the first insertion hole and the second insertion hole, allowing the spinning mass to be rotatable. The driving assembly includes a stator fixed to the mount component and a rotor mounted on the spinning mass.

An upper limbs training device includes a housing, a sleeve ring, and a spinning mass. The housing includes two casings and an annular rail. The casings surround a space. The annular rail is fixed in the space. The sleeve ring is rotatably disposed on the annular rail. The spinning mass includes two shaft portions located at a first and second insertion hole portion of the sleeve ring. Each casing includes a first, second and third protrusion portion. In each casing, the first protrusion portion is located between the second and third protrusion portion. Two recesses are respectively formed between the first and second protrusion portion and between the first and third protrusion portion. The first protrusion portions form a base portion. The annular rail is mounted on the base portion. The second protrusion portions form a first grip portion. The third protrusion portions form a second grip portion.