Hi, I was hoping I could get some ideas from people. Money is tight and I can't afford my gym membership anymore. I put on a bit of weight over the holidays and I really want to get back to working out. I want to lose about 20 pounds. Can anyone give me some free/cheap ways to lose weight. I already walk a ton, I live in the city with no car. I hate running outside, I miss the eliptical

So I have been trying to go on extra walks. I try to do some yoga at home too. Does anyone have any ideas? Good workouts for home (which is a very small apartment) I know I should just run outside but its COLD here by the time I get home from work it's 17 degrees out and lately the ground is covered in snow. I really need some cardio that gets my heart rate up and if you know of a good small space/indoor workout that does not require large equipment please let me know!