Abstract: An exercise machine is operable in a first mode for simulating a cycling activity and operable in a second mode for simulating a stair climbing activity. The machine comprises a frame and a flywheel operatively connected to the frame for rotation relative to the frame about a flywheel axis. At least one stepping member is operatively connected to the frame for movement relative to the frame between raised and lowered positions. The stepping member has a stepping surface positioned and configured to be stepped upon by a user. A stair-climbing drive mechanism is operatively connected to the stepping member and operatively connected to the flywheel in a manner to cause the flywheel to rotate about the flywheel axis upon movement of the stepping member from its raised position to its lowered position. At least one crank is operatively connected to the frame for motion in a circle about a crank axis.

Abstract: An exercise machine of the present invention is transformable between a first mode for simulating an activity such as skiing or rowing involving reciprocating linear motion and a second mode for simulating a cycling activity. The exercise machine comprises a frame, a shaft operatively connected to the frame for rotation about a shaft axis, a flywheel secured to the shaft and rotatable therewith, and a runner. A drive roller is operatively connected to the frame and is engageable with the runner such that forward or rearward movement of the runner causes the drive roller to rotate. A one-way clutch operatively connects the drive roller to the shaft so that the drive roller when rotated in a first direction causes rotation of the flywheel, and is free wheeling when rotated in a second opposite direction. A pair of offset cranks are operatively connectable to the shaft and a pair of foot pedals are connected to the cranks.