Morning training vs evening training?

personally, i wuld just do what works best for your schedule, is good for your goals, and allows you the best workout.

i work out in the AM and PM, to fit in each sport 3-4 x per week....

Do both, then you don't have to choose.

Getting in workouts while training for triathlons is simply, when does it fit.  If it fits well in the morning and you are not doing two workouts a day, then go for the morning.  If it doesn't fit, go for noon or the evening.  Eventualy you will be doing both, so it really does not matter for now.  Also, it really shouldn't have that much of an impact on your weight loss.  You workout more, overall, you are more concious of your diet overall, you become more fit with less fat overall.  This isn't a quick fix, grapefruit diet thing, it is a long term lifestyle shift.  So over the course of a year or 3 you will end up where you want to go.  It is all just fitting things in to your schedule in a manner that makes it work for you so that you will be less likely to quit.  If you are not at the weight that you want to be 2-3 years from now, then you can get into the micromanagement of when you eat what and when you workout to maximize the carb replenishment of eating relative to workout time, etc.  For now, simple is better and enjoy. 

I have a fairly complicated life schedule so when there is a hole in it I'm doing something.  Actually right now looking ahead to next week, I'll be traveling so I am online picking hotels with decent gyms...

I have found it easier to be consistant in the morning.  Too many things can come up later in the day.

Plan for the morning, then if some evenings work out you can get in a second workout.

I do both.  Or, some days I do lunch instead of evening.  But I find it really hard to get 3 sports in without doing AM and PM.  AM makes it less likely life will interfer though.  I vote you use whatever time period your most likely to fit your workouts in. 

X2. i enjoy going for a late night run though. But most of my swimming and biking is morning/lunch 

I'm not a morning person, so I workout out after work. Although on the weekends, the first thing I do after getting up is workout.

Up at 3:30 and out  the door before 4AM on most days.  Have not started two a days yet  My plan M-F  will be to run or ride in AM and swim in PM.  My swim will always take place in PM M-F due to work schedule.

I have an irregular life schedule, so I work out at all hours depending on the day.  By far my best workouts are around 10am, after a solid breakfast and a little time for it to settle.

I HATE working out first thing, but it works fine.  Although I find I eat way too much for breakfast if I workout before eating.  I don't find that I get any more tired later in the day, but it's a mentally hard time for me to be working out (I am NOT a morning person).

I have been working out after dinner (8-9pm) quite a bit lately, and don't like it.  I'm slower, lazier, don't feel as good, and am more sore the next day.  But sometimes, it's either that or nothing, so it works...

The pool I swim at is much more accessible in the morning.  I can almost always get a lane to myself if I'm there by 5:45. So, I swim in the morning.
I bike in the evening on weekday bikes and right after the swim on weekends. My weekday runs are with a group in the evening and my solo long run on the weekend is whenever I feel I'm ready on Saturday (typically about 10am).

Structure has been key so far.

I usually do well in the morning, but the last few months have been total slackitude.  My workouts are few and far between.  And in the evening after work by the time dinner is done and kids are in bed I have no motivation.

While I was doing Sprint & Olympic distance, 1 workout a day was fine.   When I trained for Half IM, then I had 2 workouts.  Some were morning or at lunch for my first workout.  But almost always during the week, I had an evening, afterwork mission. 

I'd focus on your schedule.  Does one allow you to accomplish your training more easily?   That's the key.  Just get it done..   Your body will adapt to what it's being put through.   But GET it DONE..  That will make you stronger.

cant beat morning. do they suck? yes but only til you wash your face and brush you teeth. after your done you say "thank god that $hit is over with

x2  (although i'm not at the 4x frequency yet)

I am a morning person, so I prefer to do as much of my training as possible in the morning.  But truth is it takes before & after work to get everything accomplished. 

Your question, seems to lean towards what might be better to promote weight loss?  I believe I have read (I'm no expert on the human metabolism), that longer, slower workouts in the morning before you eat are very helpful in creating weight loss -- particularly of body fat.  Since you haven't eaten and your body is already partially deprived due to no nutrition intake while you sleep, it doesn't take long for your glycogen stores to be depleted and for the body to seek anaerobic sources of energy.  It does this via the breakdown of stored body fat.  The key is long/slow.  If you try to go max aerobic, you'll just -- I believe the technical term is 'boink'.  Hit the wall so to speak and run out of energy. 

Part two of your theory is also, I believe, supported:  pumping your metabolism 1st thing in the AM increases the calories you burn all day.  The tired feeling later in the day is probably due to needing more fuel.  But it could also be partly the need for sleep.  I'm out the door at 4 AM so I have an 8 hour day in by noon.  It is not uncommon for me to catch 30 mins of nap over my lunch hour.  My body needs it.  I try to eat a light, energy rich mini-meal around 3:30-4:00 PM so I am ready to go for the evening portion of my workout day.  Many times I feel too tired to do the evening stuff, but that's mostly stress from work, etc.  As soon as I get in the pool or on the bike, I feel fine (most of the time).  Usually my evening activities are of a higher intensity than the AM workouts.

Hope this helps.  The key, as many have already indicated, is to find what works for you and what fits your schedule.

Good luck & keep at it.

Morning is way better. You just roll out of bed and do it and don't really think about it. With afternoon workouts you have the entire day to come up with excuses why you shouldn't and more things get in the way in the afternoon.

Only problem with morning workouts is you have to go to bed early and wake up in the dark. All in all I LOVE morning workouts.

It was REALLY hard to get used to morning training. It was hard to get out of bed. I felt tired and miserable. Switching the body clock takes time. That said, it was the best thing for my training. Training is better in the morning, before the day has taken its toll on your body and mind. The best part is that it sets you up to feel great for the rest of the day. You can look forward to coming home to relax with your family without that workout hanging over your head.

I train actually when i can, monday thru friday usually in the evenings. on the weekends its usually in the mornings. Sometimes on my vacation days i try to do a brick.

I can't get into the what is better for my body.  I have to work out when I have time.  I work full time and have 2 young boys.  Right now, late evening/night workouts is the only consistency I seem to have.  As soon as I get up at the crack of dawn a few days in a row, my 16 month old decides to change his wake up time.  I can't be all over the place so I am just sticking with runs/gym workouts after my little one goes to bed at 7:30.  My husband is out the door by 5 most days for work so it leaves me alone with both boys.