Ketosis diet. I lost 25 pounds last year from eating meat and vegetables and not working out.
I have been working out a little bit (cycling) for better cardiovascular health, but not so much as for it to be the primary way to lose weight.
Minimising carbohydrates has been far less of a challenge than expected - rice, chips, crisps, pasta, bread are all things I adore, yet being able to fill up with vegetables and fatty meat has been plenty satisfying.
For me, it's the first diet that has worked well in a long time, and easily too.