I would suggest building a motor first.
cats and dogs
To build stamina long slow distance jogging is best
Well, honey, a mousetrap car has traveled over 500 meters in a single run, which is quite a feat for a little contraption powered by a mousetrap. Those tiny wheels can really haul ass when they want to! Just goes to show you, never underestimate the power of a good old-fashioned mousetrap.
When the trap is fully closed, its best it the string is no longer touching axle to prevent back-wind.
long distance jogging, cycle, swimming
Long distance telephone lines.
As well as great exercise,you can build stamina and endurance for both long and short events
Long distance running helps your body burn calories, build muscle, and increase overall fitness. It does cause additional strain to the legs and joins.
love story
An odometer for measuring long walkable distance. Long distances on the earth are probably best measured by geographical positioning systems (GPS).
With long-travel supension and the best air filtration you can get.
There is no one single best caliber, but to get an answer, you need to be a little more specific. Rifle or handgun? Define long distance. 50 yards? 100 yards? 1000 yards?