The crux of my question is: What is the best form of exercise for
long-term weight management?

My exercise routine consists of a variety of sports:
-Weight lifting (4/week)
-Cycling (2/week)
-Running (2/week)
-Yoga (1/week)
-Tennis (1/week)
-Rollerblading (1/week)
-Soccer (1/week, seasonal)
-Softball (1/week, seasonal)
-Boxing/kickboxing (2/month)

So, obviously, I have a broad mix of activities, but I'd like to be
able to focus on one or two at the most and focus my energy there. My
main goal is weight maintenance (not loss or gain). I'm 30 years old,
at a good weight right now and a 36" waist - what's the best form of
exercise to maintain my current body?

Should I be looking at other forms of exercise? I live in Los Angeles,
so virtually any form of exercise is accessible.

The ideal answer would contain justification for their answer while
keeping in mind the practical nature. For example, rock-climbing may
burn a lot of calories, but it's impractical to do it very often.

I am just completing the writing of the exercise portion of a 90Day
Antiaging Program about to be launched on www.antiaging-wellness.com
so some of the content may be of interest to you.

Your exercise program already seems well structured for weight control. 

The best weight control is firstly, Weight Training and secondly,
Cardio [High Intensity Interval Training]. Both of these are designed
to build muscle. Muscle in turn, with its higher metabolic rate than
fat, continues to burn fat 24x7. Doing hours of moderate exercise like
running does nothing to build up muscle and is an old fashioned,
flawed view on weight reduction.  Doing high reps of exercises is also
of little benefit for weight management.

You don't mention the type of running or cycling program you do, but
if you can concentrate on HIIT rather than long endurance; this is
better for weight control. I note you are also into several sports, so
keeping a balanced weight profile will keep the body working as a
total unit and reduce the risk of injury. Really focus on this, as it
is easy [especially if using weight machines at the gym] to get the
muscles out of balance. Great to see you have a yoga routine in there!

Weight Training is by far the best - don't worry about the number of
reps; instead use the max exertion technique. In other words, use
sufficient weight and reps to get to the point where you feel you are
really working hard - then push ONLY 2 more reps.  Rest for 30 secs.
Do 2-3 sets, twice a week is plenty. Allowing 48 hours in between
allows the muscle to repair itself.

Remember to ensure you have sufficient protein and carb nutrition to
support muscle development, even if you are on a diet to lose weight
otherwise you start losing muscle, and this leads to more body fat.

HIIT
20 mins [Max] Cardio with 6 x 30/60 second blasts at 85% Max Heart
Rate. Any longer than this and you start increasing free radical
production.

Watch your program doesn't reverse muscle by being overworked.

Hope this helps,

I am just completing the writing of the exercise portion of a 90Day
Antiaging Program about to be launched on www.antiaging-wellness.com
so some of the content may be of interest to you.

Your exercise program already seems well structured for weight control. 

The best weight control is firstly, Weight Training and secondly,
Cardio [High Intensity Interval Training]. Both of these are designed
to build muscle. Muscle in turn, with its higher metabolic rate than
fat, continues to burn fat 24x7. Doing hours of moderate exercise like
running does nothing to build up muscle and is an old fashioned,
flawed view on weight reduction.  Doing high reps of exercises is also
of little benefit for weight management.

You don't mention the type of running or cycling program you do, but
if you can concentrate on HIIT rather than long endurance; this is
better for weight control. I note you are also into several sports, so
keeping a balanced muscle profile will keep the body working as a
total unit and reduce the risk of injury. Really focus on this, as it
is easy [especially if using weight machines at the gym] to get the
muscles out of balance. Great to see you have a yoga routine in there!

Weight Training is by far the best - don't worry about the number of
reps; instead use the max exertion technique. In other words, use
sufficient weight and reps to get to the point where you feel you are
really working hard - then push ONLY 2 more reps.  Rest for 30 secs.
Do 2-3 sets, twice a week is plenty. Allowing 48 hours in between
allows the muscle to repair itself.

Remember to ensure you have sufficient protein and carb nutrition to
support muscle development, even if you are on a diet to lose weight
otherwise you start losing muscle, and this leads to more body fat.

HIIT
20 mins [Max] Cardio with 6 x 30/60 second blasts at 85% Max Heart
Rate. Any longer than this and you start increasing free radical
production.

Watch your program doesn't reverse muscle by being overworked.

Hope this helps,

Sorry about the duplication there - i went to change an error "keeping
a balanced WEIGHT profile" to "keeping a balanced MUSCLE profie" and
ended up double posting....DUH!