Its temperament includes being very fierce, very aggressive, strong, vigorous, and relentless (high stamina). Moderate lacing is not incompatible with vigorous activity. Smaller, slower growing seedlings are more susceptible than those that are larger and more vigorous. It can also develop after vigorous exercise. Endorphin production can also be triggered by vigorous aerobic exercise. This was a community characterized by vigorous activity. Vines planted in flint tend to produce the most vigorous and longest lasting wines. The interaction between currents, sea ice, and weather makes for a vigorous and productive ecosystem. Exertional heatstroke appears in individuals after vigorous physical activity. Throughout summer, pinching back tips of the most vigorous growth assures more abundant canopy development. Tom grows into a vigorous and lusty yet honest and kind-hearted youth. The queens of Africanized bees produce more vigorous and frequent bouts of piping. Workouts elevate metabolism for up to 14 hours following 45 minutes of vigorous exercise. The plants had larger leaves, were taller and had more vigorous roots. They are naturally well groomed, vigorous and alert.