I am sadly in worse state than i thought so i am thinking other than running and cycling/spinning what are absolutely fantastic exercises for getting the old heart and lungs working better and quicker than just the running. To make you aware i have gym membership that has all the machines you could shake a stick at plus boxing ring and swimming pool. Please help as i have only 6 months until i'm 40 and it would be nice to be in shape for then. { Just to be clear i am running and spinning already}