Ask HN: What are you doing to improve your health?
Strength training 3x a week.  Why strength?  Strength is the most generalized adaptation there is.  Training to be strong improves every component of fitness: strength (duh), power, agility, balance, flexibility, endurance (all 3 types) and coordination.  I would also make the argument that in day to day life strength is the most important attribute of fitness  for someone in the western world.  The ability to carry a bunch of heavy bags of groceries, to rack a computer, help a loved one in an emergency etc., almost all depend primarily on strength.  It's also the primary adaptation for injury prevention and rehab (knee and back especially).<p>People may have different fitness goals, but for someone who is untrained by far the best thing they can do is a strength program for 3-5 months before training more specifically for their goals.  I'd recommend Starting Strength, which is a simple and popular program (popular is important, because like certain programming languages it has tons of community support behind it so it's easy to ask questions and get answers).  <a href="http://www.startingstrength.com/" rel="nofollow">http://www.startingstrength.com/</a>