Hi. I'm a 53 year old female (overweight, a bit out of shape and with chronic lower back pain). So, obviously, I need some exercise and I bought a bicycle. I got a vintage reproduction Schwinn 7 speed (comfort/cruiser style). It's adorable and I love riding it! But, it is HARD to drive/ride. Even with the 7 speeds, I can barely take even a slight hill. It feels like I'm pedaling through sand even on flat pavement. (Yes, I've put air in the tires.) Not to mention, my butt is killing me (even though I put an additional gel padded cover over the already padded seat). Should it be this hard, really? I'm exhausted after only 3-4 miles. I can WALK farther than that and still not be tired. Do I need something with more speeds and thinner tires? I need to be comfortable (and have back issues), and I'm not terribly coordinated, so something EASY to shift is also a must. Any suggestions? I was thinking a "hybrid" but I don't really know what that means to me and my situation.