True, can’t you either just jack up the speed on the elliptical to require more effort for a set period, then bring it back down?
I’ve seen people running at, say a base of 7 mph and then jacking it up to 9, 9.5 for a minute or so, and then stepping back down… Maybe try the elliptical and then hit the treadmill real quick and just blast a sprint there, then head back…
Or hit the erg and do a high intensity 500m split and go back to the elliptical…