Abstract: A rechargeable electrochemical cell (10) comprises an anode compartment (14) and a cathode compartment (15), the compartments being enclosed in part by metal plates (11, 12) that define end faces of the cell (10), the two compartments (14, 15) being separated by an impermeable, ion-conducting electrolyte element (13). The cell (10) is a molten sodium/metal chloride cell, and the plate (12) enclosing the cathode compartment defines a slightly concave end face surrounded by a flat rim. The volume change of the cathodic materials as the cell is heated up to its operating temperature are accommodated by flattening of the concave end face, so the overall thickness of the cell (10) does not change.

Abstract: An apparatus for exercise use, which is easy to carry, fold up, and that can be used in methods, which include workout programs to help people improve athletic performance and promote weight loss. The apparatus may include first and second U-shaped members, and first and second attachment devices, which connect first and second ends of the first and second U-shaped members, such that first U-shaped member and the second U-shaped member form a substantially rectangular shape when the apparatus is placed in an unfolded and flat state on a ground surface, and the apparatus can be placed in a folded state in which the first U-shaped member sits on top of and is substantially aligned with the second U-shaped member. The apparatus may further include first and second straps, which form a plus sign, and which together with the U-shaped members may form four substantially rectangular openings.

Abstract: An apparatus for exercise use, which is easy to carry, fold up, and that can be used in methods, which include workout programs to help people improve athletic performance and promote weight loss. The apparatus may include first and second U-shaped members, and first and second attachment devices, which connect first and second ends of the first and second U-shaped members, such that first U-shaped member and the second U-shaped member form a substantially rectangular shape when the apparatus is placed in an unfolded and flat state on a ground surface, and the apparatus can be placed in a folded state in which the first U-shaped member sits on top of and is substantially aligned with the second U-shaped member. The apparatus may further include first and second straps, which form a plus sign, and which together with the U-shaped members may form four substantially rectangular openings.