In this world, everyone has magic, but differing levels of ability. The average person (AKA couch potato) can do barely anything with magic; lighting a candle, tiny static shocks, or lifting a pencil through telekinesis are all possible, but nothing bigger than that. However, other mages are more powerful than others because of a property called Impact.
Impact determines how powerful one's mana is; someone with high Impact can use less mana to have the same effect as everyone else or put as much mana into the spell as a regular-Impact individual to have a greater effect. If this doesn't make sense, let's use the fireball spell: a mage staple.
A high-Impact individual's mana is more efficient than a regular person's, so they can expend 1/3 the mana cost of an average person and still get the same result. If they were to put that extra 2/3s of mana into their fireball, the result would be a much stronger fireball. Essentially, high Impact allows you to do more with less.
Now, Impact is not set in stone from birth, it's determined by physical fitness (which one can improve) and force of personality (not so sure you can improve that; if you can, please let me know). Since anyone can improve their Impact by taking better care of their bodies, my question is: Will my society be highly invested in physical fitness?
Things to consider:
- If everyone can increase the efficiency of their mana by reaching and maintaining a high level of fitness, the result should be an extremely fit and healthy society. In this world, magic may not be helpful when it comes to getting a pencil when you can just walk over and grab one, but in many areas magic is ore helpful than natural methods (moving large rocks, correcting bad drywall, so on and so forth). The idea is "magic makes life easier, except when it comes to the little things."
- Assume an alternate version of our modern world here, identical but with everyone having magic. Yes, I know that's implausible, and that magic would have affected culture if it was introduced early on. In this case, it's a relatively new phenomenon, but about everyone's used to it now (like cellphones). Tech level is identical to America.
- When strength increases, Impact increases, but only to a certain extent. Some mages may then turn to steroids or take up bodybuilding to gain a slight edge over the competition-or all mages will do so. I'm not sure how willing people will be to take advantage of this, however.
- Less physical fitness means lower Impact. This means developing (or in other words, third-world) countries will be more vulnerable to attack, due to the malnutrition such areas suffer from.
As always, I appreciate your input and feedback. Thank you!