Large:

Hercules, able-bodied, burly, sizely, strapping, stout, wiry, stringy, tiger, war-built, athletic, fightious, powerful, strengthy, sinewy, stalwart, brawny, bruising, fear-setter, sturdy, strong, hefty, hunk, husky, hulk, mighty, muscle, fibrous, lusty, wicked, well-built, shadower, machismo, titanic

Small:

petite, stingy, petty, unpretentious, lithe, delicate, fragile, tiny

Fast:

swift, agile, leethe, rapid-footed, tigersom, hawkish, lightning

Slow

Sluggish, unhurried, calm, measured, deliberate, leisurely, dawdling, relaxed, lethargic, listless, slothful, precise, easy going