Weights sound like a great idea CrazyH, there’s a lot of evidence for benefits of weights for women and I believe it does help burn fat too.

I know someone with a young child who puts her in the childcare attached to her gym, it seems to work well but not all gyms have that. Exercise classes at gyms are great for anyone new to exercise as they teach the correct form. How about swimming with your son? You might not be able to do lengths but you’ll both be moving about and that’s good.