Elliptical trainer

[0023]FIG. 3 is a side view of an elliptical trainer 6 in accordance with an embodiment of the present invention. FIG. 4 is a partially enlarged view of the elliptical trainer 6 shown in FIG. 3. Referring to FIGS. 3 and 4, the elliptical trainer 6 includes a supporting frame 60, a resistance device 61, two cranks 62, and two operation units 63. The resistance device 61 includes a shaft 610. The two cranks 62 are respectively arranged at the left and right side of the shaft 610, and a first end of each crank 62 is connected to the shaft 610. The two operation units 63 are respectively arranged at left and right side of the shaft 610 and each connects to one crank 62. Each operation unit 63 includes a pedal 630, a first pivot 631, a second pivot 632, a third pivot 633, a front swing rod 634, a rear swing rod 635, a middle swing rod 636, a push rod 637, an amplitude-linking mechanism 638, and a pedal-supporting rod 639. The first pivot 631 is mounted on the supporting frame 60. The second