@bhu: Resistance is strictly half damage, while vulnerability is double damage
--pseudo-edit: Gazzien beat me to it.
@Rin: feel free to make a character if you like. I already have more players than I have spaces for. I'll likely have to choose between characters that are most interesting, have the best backgrounds or core concept.
@Raineh: gymnastics takes a surprising amount of strength, and someone with strong leg muscles is likely to be a better jumper than someone who's willowy and lithe. Your height also has some effect on how high you can reach in a high jump.
Now, I understand where you're coming from, but I have to disagree with you. Jumping a long distance definitely has more to do with your physical power than with your reflexes and agility. Those help, and even someone who jumps farther may have more problems actually landing on their feet.
Besides that, do keep in mind how important advantage and disadvantage are in 5th edition. Though a dwarf with high strength certainly can jump in heavy armor, he may still be ruled to do so with disadvantage, 3 specially if he's carrying a sword and shield and a dozen other things. They unarmed monk in a cloth tunic may get advantage, especially given their natural command of their own physical and mental faculties.
@Gazzien: Sure, though you do sacrifice your other stats a bit in doing so. It may be better to start with 15, boost it to 17 with race, and add a point later by feat or double-stat boost, but that's your call. Keep in mind, unlike previous editions, 5e is balanced around assuming that 20 really is very high for an ability score, and only the most dangerous monsters usually are the only ones who can break those limits.