Why is it more difficult to ride a bike up a hill then it is to walk up that same hill?
109528
When you are walking up the hill, you are using your muscular effort to move your body weight forward and up against the force of gravity.\n\nWhen you are biking up the same hill, you are using your muscular effort to move your body weight plus the weight of the bike foward and up against the force of gravity.  In addition, you have the resistance of the gears which requires further muscular exertion to complete each revolution.  That's why you can usually only ride up a hill on a low gear which reduces the resistance on the pedals.
139400
the air gets thinner as you rise in elevation.  the thin mountain air doesn't trap the heat as well as the thick air near sea level does.
61020
cause with more wheels you wouldn't be any faster, just less likely to fall over. \nEach wheel generates friction while in contact with the road, so with more wheels you would need more energy to go on. Apart from friction on the road you also will loose energy by friction between all the moving parts for energy transmission (chain, ball bearings and so on). \nIn addition with more wheels your "multicycle" also will inevitably get heavier. That means you need more energy/effort to accelerate it, and also more to stop it. While going downhill will be easier going uphill will be harder. \nAlso you could not lean into a curve.\nYou would also need more space on the road. With a lot of car drivers behaving like they do, as you are much slower than a car you would get honked at a lot. \nActually, you only need one wheel, you can also unicycle. It does take more practise though, so most people choose two wheels.
113384
Skiing - Do you know how hard it is to pick your a$$ up off a hill with a board attached to your feet so you have to move them together???
342683
The impact on your legs is greater when you are running outside compared to running on a treadmill.  Also, most treadmills have no "downhill" setting, so downhill running can be a little harder on your legs.  Try running outside for the same amount of time as you do at the gym.  Don't be surprised if you have to stop and walk, as the outdoor running can be harder.  Also, in the beginning, try alternating running outdoors and indoors until your legs get used to the impact.  Enjoy--outdoor running is more interesting than in a gym for most people!
1086196
It is called a recumbent or sometimes known as a "bent".  There are some very active, internet savy communities of bent fans out there.  I am sure an internet search will show   This is a sample http://www.bicyclinglife.com/PracticalCycling/FancyBikes.htm\n\nYou can find them generally through the better bike shops or at times through dealers who operate out of their houses.  \n\nThese bikes are low to the ground.  They fly downhill because of this and are many times harder and slower to get up hill.  I know some like them because they can be easier on your back.  Recumbents riders tend to be passionate about their bikes. I know several of them and they just take them everywhere.  A guy I ride with occassionally is getting ready to do the Race Across America on a bent.  \n\nHave fun on your search.  There are so many resources out there that will go into much more detail that I will leave you on your own to search.
208155
walking and riding a bike are both good exercises...what needs to change is the intensity of the workout...consider walking up/down hills...different terrain....and as for biking riding on different terrain will give you intense or moderate workouts...just change up your workout and try different lengths of time to see what works for you...good luck!
139113
practice....its a little easier if you have a rear shock, but there is a delay with the shock due to more pre-load thats slows you down, so going over obsticles are timed differently,  i prefer hard tail.  level your cranks parellel to the ground (or close) push down with  your weight bending your knees, into the bike towards the ground, if youre using platform pedals angle your toes down so you have some grip on the pedals and shoes. after you preload down on the bike, use the energy from the preload to pull the bike upwards with your feet hooked to the pedals and up on the handlebar.  like your jumping with your bike under you.  you dont have to be going fast, you can even do it stalling (being still). and practice
818232
It is very easy when you are doing a steady uphill climb on a mountain that seems to be covered with oil. However, God always throws me a rope to pull me back up so I do not fall to far or too fast.
735414
Not all mountain bikers do that.  Watch a pro sometime.  Some mountain bikers prefer to mash, but some prefer to spin.  I aim to spin.  I shift down, keep my cadence as steady as possible and keep my momentum up.  However, occasionally, due to a technical feature, a turn or a super steep hill, I end up mashing a bit more.  \n\nYou will be much more efficient if you spin, however, occasionally, being able to mash up a short steep hill can be beneficial.
330355
If the bike is powered by pedals rather than a motor, and the race is uphill, the horse would be faster.\n\nOn a flat horse track, the horse would also be faster because the horse is built to cover soft ground.\n\nOn cement, or other hard packed surfaces, or steep downhill, the bike would be faster.
1169837
The proper name for the trick is a "bunny hop"\nYou pull up hard with all of your body weight and the bike comes up with you, the harder you pull up the farther your bike will come up. After some practice you will feel the bike come off the ground more than it did when you first tried it but keep trying it and dont give up, Tricks are hard to learn but after you learn them and begin doing the better you will feel a great sense of "WOOOOOOHOOOOOO" lol
115763
Gravity states that if you drop 2 things at the same time, regardless of weight they would hit at the same time. Yet a larger mass rolling down a hill will gain more speed. Just watch the difference in speed from the skeleton & bobsled teams.
195093
That is a tough one. It really comes down to your physical fitness and ability. Ride at a speed which you feel comfortable with, and push it out. Its alot easier to ride a bike into a headwind than is to run, if you've ever tried it. Just do what feels right. You know what I'm saying, baby!
801912
First the distance change is totally negligible.  Also, unless the mountain is near the equator and you are climbing around noon, you are usually not getting closer anyway.\n\nThat said, the sun does not give much heat in the form of heat.  The sun gives energy in the form of mostly visible light.  That light gets absorbed by opaque object, namely the ground, which then re-emits infrared (heat) energy. So, technically, climbing a mountain gets you further from the bulk of the energy re-emitter.\nBut the real reason of the cool down of altitude is due to the drop in atmospheric pressure.  Take a volume of air at sea level, and bring it up to altitude.  Because of the lower pressure, that air will expand. But any expanding gas cools, and that explains why the air gets colder the higher you get.
443329
the only possible way for you to be able to go "up & down"...\n\nif your bum is made of rubber cause its gonna hit the ground ground ground.\n\n:)
213846
yeah , but make sure that u know how to ride it, its hard to control at greater speed, but u know the bike is coooooooool \n\ngo for it man