Congratulations on your progress so far!

While exercise improves fitness and helps keep the pounds off, it doesn’t really contribute to weight loss. However, it is possible to gain muscle at the same time as you lose fat. This is particularly common if you recently started exercising. Also, while you've already lost a lot of weight, weight loss will often slow down as you move towards your goal weight.

It is a good idea to use something other than the scale to gauge your progress. For example, measure your waist circumference and body fat percentage once per month. Also, how well your clothes fit and how you look in the mirror can be very telling.

In the meantime, keep on doing what you're doing, you're doing a great job!