Doubles volleyball does wonders for amateur players. Not only do they get a ton of serving & passing reps...but those in the stands will invariably see players enjoying themselves: engaged, smiles or strong emotional connection to the game.
-Playing outside is fun. There's plenty of studies that show being outside in nature lights up brain activity.
-The game is difficult and covering the whole court with 2 people produces a lot of fun plays. Most of those plays don't have anything to do with being tall (which most of us aren't)....Instead these plays usually relate around effort, defense, or vb IQ.
-Doubles players are involved the ENTIRE game. Every play requires both teammates and mistakes don't equate to bench time. No substitutions means no bench frownie faces or impatient parents in the stands. Note: you'll rarely see a kid happy on the bench -- but they do exist. It happens b/c a player spends most of his competitive career on the bench and learns to prefer the safety of it rather than the chaos of the game.