As a woman and a personal trainer, one of my biggest pet peeves is hearing people say they only need to do cardio to lose weight. That is one of the biggest fitness myths out there today. It has been proven repeatedly that adding weight training to your regular exercise program will dramatically increase your fat loss.
Cardio conditioning is great! Biking, running, swimming, etc. all have great health benefits BUT if you want to burn more calories AFTER your workout, while you are relaxing at home, add 30 minutes of intense strength training 3 days a week to your normal routine. Additional benefits of regular weight training include injury prevention, increased bone density, increased metabolism, and it promotes better form for regular cardio exercise like spin classes, or running.
Check out this article for more info: https://experiencelife.com/article/lift-to-lose-weight/