I couldn't mod my treadmill to get any significant amount of incline but quickly landed on the idea of using my staircase and thus began a 4 hour regimen (10:30 pm to 2:30 am) of running up and down 25 steps 120+ times. It was highly effective (96 kg to 83 kg) but I blew out my knees and right ankle after 4 months of this, forcing me to stop. It also was a problem when my neighbour's wife kept peeking through their door to let me know they didn't appreciate all that clacking at 1 in the morning.
4 years later I'm holding onto the same level I reached back then (84 kg) and I'd love to do it again and get it down by another 10 kg in an intense two-month sprint. But I get cold feet every time I think about it.
I'm taking Vit. C now to boost collagen so my joints should fare better the next time I try it. The lawyer and his wife have also moved out which is another annoyance taken care of. Whether I can resist the urge to push hard after seeing the results is the question.