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Walking is very underrated as exercise. People think they have to go to the gym or run a marathon for it to count. In fact, if you're overweight, running could shoot your HR way up (+190). Try walking.

I did similar a few years ago. Dropped from 172lbs (78kg) to 139lbs (63kg) in 5 1/2 months. Near 21% weight reduction in body weight, just by counting calories and walking (granted, quite a bit). There definitely isn't a "wall" you encounter when losing weight. I tracked everything I ate (often to the gram) and it felt like little more than basic arithmetic.

Had a friend take notice, so he took it up himself. Dropped the best part of 60lbs (27kg) over the course of the year. Very different diet, but again tracked everything he ate (again, often to the gram) and lifted weights instead of walking. He was baffled with how simple it ended up being, but was pleased with himself nonetheless.

Will have to try walking more, this may be good suggestion.