Just because your goal is to lose weight, don’t think you avoid lifting weights. One of the greatest benefits of resistance training is insulin sensitivity. Insulin sensitivity means that your muscles are receptive to insulin bringing fuel to be stored in the muscle- NO, this does not make you bulky. It actually provides energy for when you move those muscles.
The opposite of insulin sensitivity is insulin resistance which means that your muscles don’t respond to insulin so the fuel is diverted to your FAT CELLS for storage. Increased insulin resistance leads to, not only fat gain, but also diabetes.