Here are simple ways to get started without any equipment.
1. Walking or Jogging
It’s nice to get outside and take in the scenery and fresh air, but bad weather days hinder your ability to leave the house. Consider these alternatives - Got stairs? Try walking them for 10 min. You can tone your lower half while benefiting from moderate cardio-respiratory exercise at the same time. If you don't have stairs, why not jog in place - It's good for your heart. You can jog in place while watching favorite TV shows or listening to music. This requires some jogging shoes to eliminate unnecessary stress on the knees, but except for that no equipment needed.
2. Squat Exercise
This is great for for the legs and rear end. If you have issues balancing, try using a foot stool to avoid falling over backwards or you can keep your arms up in front of you for maintaining balance.
3. The Jumping Jack Exercise
If you forget what it's like to be a kid, these may jog your memory.
More importantly, a couple hundred of jumping jacks will surely get your heart rate going strong. They can be used as a warm up, or you can do active rest between sets of squats.
4. Push-ups
This is a fantastic upper body exercise that involves the shoulders, pectorals(chest), and triceps muscles. Pushups are sometimes tough for you, if so then you can do them on your knees instead. As your strength improves then try full pushups.
5. Ab Crunches
Abdominal crunches are excellent to tone up your abs. Abdominal crunches are preferred over sit ups since they don't cause stress to your lower back. Don't pull your neck, instead keep your arms across your chest or you can keep your hands resting lightly on the head.
Try these other ideas about ways to get an improved workout at the house with low cost and room required, here are 2 things you may consider...
Jump rope
At a cost of under 20 dollars, this is a deal. Try this for a aerobic workout in a brief 15 min.
Adjusting Dumbells
These may run you beginning from 30 bucks for some used, to maybe $250 per set for the more expensive models. The amount of exercises available with a set of dumbbells is truly unlimited, and they they don't require space.