Combination stationary exercise equipment

A drivetrain for a modular exercise machine including a plurality of attachments, the drivetrain comprising:

• a frame;
• a common axle supported by the frame;
• a first input receiver operably coupled to the common axle, the first input receiver operable to couple with a first attachment of the plurality of attachments;
• a second input receiver operably coupled to the common axle, the second input receiver operable to couple with a second attachment of the plurality of attachments;
• and
• a resistance member supported by the frame and operably coupled to the common axle to provide resistance against rotation of the common axle.

A combination exercise device comprising:

• a stationary bicycle attachment including a stationary bicycle drive member having a first receiver member operable to receive a first mechanical user input and a first output member for transmitting the first mechanical user input;
• an elliptical exercise attachment including an elliptical exercise drive member having a second receiver member operable to receive a second mechanical user input and a second output member for transmitting the second mechanical user input, the second receiver member and the second output member each being separate from the first receiver member and the first output member;
• a common axle operably coupled to the stationary bicycle drive member to receive the first mechanical user input from the stationary bicycle attachment and operably coupled to the elliptical exercise drive member to receive the second mechanical user input from the elliptical exercise attachment;
• and
• a resistance member operably coupled to the common axle and operable to provide mechanical resistance against the first mechanical user input and the second mechanical user input.