Abstract: A multifunctional fitness system may allow for high-resistance exercises through the distribution of weight upon a frame pivoting on the ground. In particular implementations, while a user lifts one end of the frame, the opposite end pivots. The weight of another person (and/or that of conventional weighted plates) can be placed on the frame in locations yielding the desired leverage and, thus, resistance felt by the lifter. The frame may have various axes upon which it can pivot and grip points, thus offering a broad range of exercises that can be conducted. Reorienting the frame to be resting on differing sides results in additional feasible exercises. Optional integrated electronics (typically in conjunction with existing smart devices) may use kinematics and/or structural flexing to calculate felt resistance and provide automated instruction to the various users. The may also collapse into a compact, rollable configuration for easy transport.

Abstract: A portable positive air filtration device including a respiration component and a harness component. The harness component being connected with the respiration component so as to secure the respiration component against the face of a user and covering the mouth and nostril of the user. One or more fans or air-moving components, one or more filters and at least one power supply provide filtered air to the user at a positive pressure. In some examples, the device includes a mask housing, a filter, a fan and an electronics control system. One or more batteries are provided for powering the device. The electronic control system can be connected with an electronic device for real time monitoring and control.