Walking is enough if you do enough. I walked over 13k steps today and burned nearly 3000 calories according to my smart watch.
For a women no more than twice a week exercise in a home gym. It's not good for a woman who isn't overweight to train too much/hard, it can lower fertility.
I don't think you burn 3000 calories by walking 13000 steps.
Ai from the internet "Walking 13,000 steps burns approximately 450 to 700+ calories, depending heavily on your body weight, pace, and fitness level, with heavier individuals and faster paces burning more, but a general estimate is around 0.04 to 0.06 calories per step, equating to roughly 520-780 calories for many, but less for lighter individuals."
If you don't use all you muscles you lose them. The article has some modern ideas ignore them it is not the point.
https://www.nia.nih.gov/news/how-can-strength-training-build-healthier-bodies-we-age