But whilst tango, with its slow, strenuous movements and melancholy music, remains a minority interest, salsa's worldwide appeal shows no sign of weakening.
So some researchers, including Provine, believe that the strenuous movements might have a more general role in rebooting the brain – when you are sleepy they make you more alert, or when you are distracted they make you more focussed.
What's more, the strenuous movements could also flex the membranes of sinuses – fanning a soft breeze through the cavities that should cause our mucus to evaporate, which should chill the head like air conditioning.
Village life required quite a lot of heavy lifting and the Seto girded themselves with the belts tightly, like a weightlifter, which made their strenuous movements easier -- it also contributed to the upright posture for which the Seto are known.
In order to play their instrument, musicians need to frequently repeat physically strenuous movements.
Conversely, muscles composed of fast-twitch fibers often depend on glycolysis in order to carry out rapid, strenuous movements.
Overexertion or strenuous movements was the most common cause of injury (figure 2) resulting most in an acute muscle strain (figure 3).
Four items addressed the handling of instruments, (including); reaching for instruments without strenuous movements, use of forceful movement to perform clinical work, performing clinical work with arms above shoulder height in addition to bending and twisting of the neck.
2. Instrument handling: Regarding the handling of instruments, four working characteristics were assessed: whether four handed dentistry is facilitated at the school, whether instruments were within hand reach so avoiding the need for strenuous movements, work being done with arms above shoulder height and finally, using forceful movements to perform clinical work.
