commands
        .spawn()
        .insert(Racer(1))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(2.));
    commands
        .spawn()
        .insert(Racer(2))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(4.));
    commands
        .spawn()
        .insert(Racer(3))
        .insert(Position(0.))
        .insert(Velocity(0.))
        .insert(Acceleration(0.5));

    let racer_init_stats: Vec<f32> = vec![2., 3., 0.5];
    for (n, &a) in racer_init_stats.iter().enumerate() {
        commands
            .spawn()
            .insert(Racer(n))
            .insert(Position(0.))
            .insert(Velocity(0.))
            .insert(Acceleration(a));
    }