Hi,
I really like your article! Thank you :-)
What do you think of skipping rope?
As I heared that round about 10 minutes of skipping rope is equivalent to 30 minutes of jogging ;-)
A skipping rope costs less than 10€ and if this is still too much you could just imagine the rope an start jumping at place for 10 minutes without the rope. This might be looking funny, but will be very effective at home (where no one sees you) and be a great workout combined with squads, push-ups, dips.. etc. at no cost at all. :-)