Rugby union, rugby league, cycling, soccer and AFL (aussie rules) if head injuries ae present, Ice Hockey, and NFL
Feud:
Football
Hockey
Biking
Car Racing
football, hockey, lacrosse, baseball, waterpolo
Bike riding, sky diving, skate boarding, Snowboarding ect. basically any exercise you could hurt your head doing.
Football, baseball, softball, hockey
The sport of cycling.
Cycling
That depends on your age and where you're at. Helmet laws differ from place to place. Some places require all people to wear a helmet, other require people under a certain age to wear a helmet, some don't require bicyclists of any age to wear a helmet at all.
State-by-state guide to motorcycle helmet laws http://news.consumerreports.org/cars/2011/06/state-by-state-guide-to-motorcycle-helmet-laws.html yes
All that require it
that depends on what type of exercise you are performing. Differant exercises require differant times & burn differant calories
You are not required by law to wear a crash helmet in Florida however i would highly recommend that you do! Florida does not require a helmet while driving a motorcycle. http://www.edgarsnyder.com/auto-accident/motorcycle-accident/helmetlaws/florida.html
Yes. Most of US states, require a rider to wear a helmet.
By dot helmet do you mean a Department of Transportation approved type ?
It depends on where your riding. Some places don't require you to wear a helmet. If it is required the actual price of a ticket would vary.
The states that do not require any sort of helmet protection are Colorado, Illinois, Iowa, and New Hampshire. AR, FL, KY, PA, RI, SC and TX only require helmets for riders 18-21.
It will depend greatly on the type of exercise you are referring to. If you are at the gym doing heavy squats, trail running, doing pilates or at a bootcamp, you will require different shoes.
NASSS
It is necessary to wear a bike helmet to reduce the incidence of head injuries suffered in crashes.Helmets protect the vulnerable parts of the skull.Most countries now legally require you yo wear an helmet.