If it's an effort, you're doing it wrong.

Now, sit on the floor cross-legged, lotus posture if you can manage it, close your eyes, and chant along wth me, "Ommmmm.....", and as you feel the vibrations filling you, visualise those muscles getting stronger, "OMMMmmmmmmm.........., imagine running effortlessly, "OMMMMMMmmmmmmm.............."

Sorry, but if you don't go into cardiac arrest, you're just not trying hard enough.

Now remember, these are toning exercises, you don't want to develop horrid nasty muscles.

Hello? - Sorry, can't come next week - done me back in.

Get that arse!

Right, twenty pressups NOW, and if I see that flabby belly touch the floor once, *thwack* it'll be six more of these *thwack*. And remember to say "Thank you, Mistress" after each one or you'll get an hour chained to the treadmill.