All terrain treadmill

An exercise apparatus comprising:

• a frame including a base member;
• means defining a longitudinally extending tread surface, said tread surface having first and second ends with said means being pivotally mounted to said frame along an axis lying in a first plane;
• a longitudinally movable endless belt having an upper and lower flight, said upper flight being supported on said surface;
• drive means on said frame for moving said endless belt longitudinally along said surface;
• and
• adjusting means on said base member for moving one of said ends of said tread surface through a range of positions extending from above said first plane to below said first plane whereby said tread surface is moved through a range extending from an inclined slope to a declined slope,
• said adjusting means comprising a cam wheel rotatably supported by said base member and having an axis of rotation, a cam lift arm rotatably mounted on said cam wheel and extending substantially parallel to said axis of rotation and spaced therefrom, and a drive means for rotating said wheel, whereby said tread surface is inclined from said first end to said second end when said cam lift arm is at its farthest position from said base member and said surface is declined from said first end to said second end when said cam lift arm is at its closest position to said base member.