exercise bike with video LISS Cardio
http://juliusjlft464.unblog.fr/2019/09/15/become-an-expert-on-recumbent-bike-workout-liss-cardio-by-watching-these-5-videos/
Even the best stationary bicycles LISS are less bulky than a treadmill or some cross trainer, also so you would swerve the travel to and out of the fitness center (time efficient for all those that have busy schedules)