@eh2xyu,
Dancing - Dancing I mean serious dancing is a way to burn energy, and actual a healthy thing to do.
Cardio - You have to run, get your heart rate up, jumping jacks, or anything that burns energy. Even standing on your toes over and over. They have specialized machines for this.
Crunches ( thing you do on your back with hands behind back most of time)
is the one thing a person could do, with no usage of cardio. I stop doing these and my body has become fatter.
Push-ups is just bench-pressing against your own weight.
1. Standing against a park-bench or kitchen top
2. You could be on your knees
3. lying on your belly
4. or suspended between your feet and hands/knuckles
5. or against a wall ( like upside down almost facing forward ) using your body as it's own weight.
Pull-up is for the upper-body.
1. you could use a platform.
2. Perform one at a time.
3. Hang until you could pull up
4. Or tie your hands to the bar and have somebody use a belt/fire to get you to pull yourself up.
5. Think of being on the edge of an airplane.
About weights. Weights is for gaining mass not making a healthier you. However it would not hurt ( not even a woman ) in her later years to get a tighter body ( after having kids of course ). Checkout that farm-granny, v. Bikini-Grandma. You could see the difference, even a mans penis and womens vagina has the ability to lift a degree of weights.
..............
About weight lifting. You see that guy "Kali-Muscle" ( who should be the new KingPin in Movie "Spider-man" ). He can lift his body up on his vertical
side like a straight line ( not even horizontal ). Reality is that him, and the Worlds champion in muscle building ( who was a 49 year old Jamaican man ) both had strokes. Why? Because of other problems with building muscle mass. Just a heads up with building body-mass. You might reach it ( and look beautiful ) but does not mean your body can support it. Same with Hulk Hogan. He works out non-stop, but over the years he has changed what he puts in his body and how he works out all together.