recumbent bike excercise LISS Cardio
https://www.storeboard.com/blogs/general/the-ultimate-glossary-of-terms-about-liss-cardio/1034185
Even the optimal/optimally exercise bicycles Liss cardio are less bulky than a treadmill or a cross-trainer, plus so you would swerve the travel to and out of the gym (time-efficient for those with busy schedules)