Elliptical workout machines can be very effective. An elliptical workout is really a low-impact workout, and you can burn as many calories as by jogging without the strain of actually jogging.
Burpies, they really work!
you jump straight up with your hands in the air
then crouch in a squat
then push your legs out backwars and do a push up
-IsaacLynch
I am a fitness trainer, so my...
when energy is derived from oxygen in air being breathed in, rather than from oxygen already dissolved in the blood (or rather, bound to haemoglobin in the blood). I.e. a longer-term exercise like...