Cycling has less impact than running, which is a bit easier on the joints. It's still not entirely safe if you go at it the wrong way though.
Not that much. Cycling is softer on the body than running - less impact - so if you're hurting from running, switching to cycling will get you a possibility to maintain your general fitness level. But generally, to get better at running, you need to do more running.
Cycling is generally considered to be better for the health of your knees compared to running because it is a low-impact exercise that puts less stress on the joints.
If that happens, it is because your body is accustomed more to cycling than to running. For someone who is more used to running than to cycling, it would be the other way around. The important point about DOMS (delayed onset muscular soreness) is to wait at least 24 hours after all DOMS disappears before training again. This will ensure systemic as well as localized recovery. Remember that workouts are catabolic and rest is anabolic. They must be in balance if you are to improve
Simple ....running... ....walking........biking..........rowing........
Cycling primarily strengthens the lower body muscles, such as the quadriceps and hamstrings, rather than the upper body. While cycling can help improve cardiovascular fitness and overall muscle tone, it is not as effective for strengthening the upper body muscles. To target the upper body, incorporating specific exercises like weightlifting or bodyweight exercises is recommended.
Brisk walking certainly does. Done properly, it is an excellent form of cardiovascular exercise. It is sustainable long term and easier on your body than running or jogging.
You need to move more, such as engaging in cardio walking for weight loss, which is easier on your body than running or jogging, and eat far less refined (processed) carbohydrates.
To make your body easier to float, you can increase your body fat percentage, which is less dense than lean muscle mass. To make your body easier to sink, you can decrease your body fat percentage and increase your lean muscle mass, which is denser than fat.
Body locomotion faster than walking.
In plains at ground level, the air is at normal pressure, and oxygen levels are normal. Higher in the mountains, the air is thin, and there is much less oxygen. Your body needs oxygen to release energy, so, the less oxygen your body receives, the less energy your body can release, therefore making it harder to run.
Because there is usually more "give" on a treadmill, they are usually easier on your knees than running outside. However, if you are running outside on a very soft surface such as sand, that surface could actually be easier on your knees than running on a treadmill. Typically, though, if you run on pavement or hard dirt surfaces, you knees would be better off if you used a treadmill.
As a matter of fact, swimming may be better than running because it has less impact on joints and more of the body is used for swimming than running.