exerpeutic recumbent bike LISS Cardio
https://www.scribd.com/document/426386813/198190LISS-Cardio-Explained-in-Fewer-than-140-Characters
Even the best stationary bicycles LISS are less bulky than a treadmill or a crosstrainer, plus so you'd swerve the journey to and from the fitness center (time-efficient for all those that have busy schedules)