My body weight is good for my height but I think i got high % body fat. How can I get healthy again?

My current source of exercise or if it even counts as exercise:

1. stretch throughout the day

2. Go on walks for 10 min about 4-5 times a day.

3. 15 pushups 3 times a day (increasing by 5 every week)

yep no cardio at all.

At this point in time, I just want to get to my ideal "HEALTHY" body stats again by losing as much fat as possible.