You want to work on cardio, so make a plan.
Just make a plan.
Pick an activity (I'm not a exercise expert). I'll use jogging on the spot as an example seems you can do it at home and you don't need extra stuff.
Everyday at a certain time when you will be home (morning is probably easier), jog on the spot.
Day 1: 1 min
Day 2: 2 mins
Day 3: 3 mins
etc. etc.
Very easy to start
Eventually you'll hit your limit. Write it down and jog for that amount of time each day.
Just an example. Do it now.
The hard part in getting started is getting started so go do it. People like to research endlessly, start!
