On an upright bike, hard pedalling is a whole body exercise, with the swaying side-to-side. Body weight is a force limiter. I’ve found it easier to pedal hard on a recumbent, against the seat back. One of my knees hurts now. It's a bummer that the upper body doesn't get exercise.

I don't know what you mean by "pushing sideways" in this case - that only applies to foot-steered Flevo bikes/trikes.

@Anibyl @mariusor @bicycle_touring @number6 @schmaker

Just to clarify for all of you. Recumbent bike balance only in some speed, for me it is ~6 kph. So on normal bike I can spin my legs go slowly, still balance and gradually push through the hill. But on this I have to keep some tempo even uphill and can't help myself by standing up.

Doubt - that bike is front heavy without baggage. Overloading a tyre doesn't add that much resistance anyway, and it's easily compensated by adding pressure.