calisthenics? push ups, sit ups, squats, lunges, run in place. have stairs in your home? walk up and down them timing it add reps or speed it up as you get stronger, long stretch routines, basic yoga, try all of this while holding a canned good in each hand, jumping jacks, jumping rope, bows, theres always dancing, nothing easier than playing some music you enjoy and dancing. there is a ton of things one can do with even a zero budget just get creative and it shall be so.
I have lost 160 pounds using many of the things I just listed, am not a member at a gym. I walk and hike in the warmer/cooler months and I ride a stationary bike (that I got off of craigslist for $40) on the colder days during winter adding many of the things I listed. its easy to find movement, so be like Nike and just do it!
As Ever
Me