I walk/hike 3 miles every day in the woods. It's not uphill but it is rolling terrain. We had 3 feet of snow 2 weeks ago and I used snow shoes until it flattened out. Now I use Yak Trac's on my shoes. It's exercise and I would like to see you do it. Any walking is exercise if you keep up the pace.
that is what happened to my old stationary bike- it was a cheap one and that makes a big difference in equipment. I love to bike outside ...this time I did research bought a high end Concept D rowing machine, the cheap ones are crap - it is not a small footprint but I find I use it every day because it is so effective -I had little stamina before now have a lot...no machine works if we don't use it..lol.
$300 set of weights?
Go to the Home Doh and get some rocks/ big rocks, bags of little and not so little rocks.
You can get a whole mess of rocks, a workout, and updates to your landscaping.
It's a threefer.