Same reason as walking up stairs is hard - you have to overcome gravity.
gravity limits us because its hard to ride a bike up hill
Food.
A hill is hard to get up and a pill is hard to get down
When you're braking hard, trying to climb a steep hill or turning hard.
it depends on how on how fast you petal and how fit you are
When a bike goes up a hill, mechanical energy from pedaling is converted to gravitational potential energy as the bike gains height. When the bike goes down the hill, the gravitational potential energy is converted to kinetic energy as the bike accelerates. Frictional forces also convert some of the energy to heat.
Doing "high knees", squats, or running up a very steep hill with weights.
No. On top of the hill the bike would have potential energy. If released, by letting the bike roll downhill, it'd turn into kinetic energy as the bike picks up speed.
All of them...up hill is so hard!
Riding a bike up a hill can be challenging due to the increased resistance and effort required to pedal uphill. It can be physically demanding and may require more strength and endurance compared to riding on flat terrain.
it will be very hard for the enemies to go up the hill and when they get there they will be too tired to fight.
Sam Hill