Is there a trick to the standing sets? Or am I just too heavy to do them (I admittedly need to lose weight)? I crank the resistance all the way up on the trainer, but when I stand, the pedals just go straight down. Can't pedal a circle to save my life. I do fine standing on the road - it's just the trainer I'm having trouble with.

I've been converting them to sitting sets, but would like to get the extra benefit from standing if possible.

Sorry if it's a dumb question