An exercise device has left and right rails that are supported on respective pairs of equal length rocker arms, and left and right skates that are movably mounted on respective rails. One or more processors determine a B1 field value for each slice that is representative of the B1 field over a selected area of the slice, accounting for subject effects on the BI field, and determine an adjusted per-slice radio frequency excitation for each slice that adjusts the B1 field value for the slice to a selected value. 5% and 20% organic peroxide and a stabilizer for preventing degradation of said peroxide in the solution. The resin sheet comprises an oriented resin layer laminated on both surfaces of the metal layer. Whereby, the predetermined condition is derived individually for each integrated circuit from a time response of the output signal.