home exercise

I think both are great alternatives (And space savers) in the home gym environment. But have any of you used either of these. If so which did you think worked best overall?

Heeelp, I need people's opinion who know about exercise when it comes to a standard bike or efx/elliptical. I wanted to buy an indoor/at home bike, and start cycling, one where i can sit up then sit down, like HIT training / superpower cycling class on my own to get rid of my bubble butt, and...