I have had an interesting chat with my DP where he expressed that he was worried about me, and my health - not in a bad 'you got to lose some weight' way but I was having a whinge about my body in general and he did sort of mirror ' look you seem unhappy and less fit than you want to be - what can we do to change that' sort of convo. He (with a tact and sensitivity that is a bit out of character for him 
) said he still found me attractive etc but was worried by why I was so tired and gaining weight
Ive always been prone to put on weight, and probably havent been under a BMI of 25 for 10 yrs at least. I have PCOS which doesnt help, and also put on muscle really easily if I do weights etc (used to compete in winter sports and used weights etc to build up muscle mass for that)
I would argue that I have no mood issues, and no symptoms of thyroid etc issues. At the moment though I am 5 ft and 83kg , and have gone up to a size 16 (usually much less than this) which seems to have crept up on me over the last 2-3 years. I have a 5 yr old and have just had a couple of early miscarriages.
I dont really have that unhealthy a diet -home cooked and lots of veg, dont smoke, dont drink, dont take fizzy drinks or fruit juice, my 2 vices are about 3 cups of tea a day and occasionally cheese. The main problem I have is I work an average 48hr week of rotating shifts, including nights and 12 hr days, and find my sleep pattern and appetite during these times really hard to control - and no matter what healthy snacks you take to work, at 2 am on a hard shift, your body craves carbs and sleep. I cant join an exercise class regularly due to shifts etc although try to drop in to yoga, zumba etc occasionally, I perhaps swim 2-3x a month as well. I bought an exercise bike to try and exercise at home and perhaps manage 3-4 30min sessions a week plus occasionally a workout or yoga video from youtube, but to be honest on long shifts or nights I do none of this, I am bloody knackered and usually out cold as soon as possible, so any routine I try and get into is ended quickly.
I have tried to work exercise into my commute eg cycling or walking but I also shift jobs fairly frequently eg 3-6monthly and can be anywhere from a mile to 40 miles away from my work, so its not always possible or indeed safe or reliable
This reads like a 'I cant do this' list but these are the constraints on me at the moment. I cant quit my job, but the hours etc wont improve for years. I need to get in better shape, exact weight doesnt matter, and would ideally like to do this by getting more exercise. Im trying not to diet per se (because being on a diet makes me a complete food obsessive and affects my concentration when Ive tried it before) but am working on portion control and paying attention to hunger cues and have managed to cut down my daily intake while continuing to eat the same foods as the rest of the family
So, mumsnetters, please help! Any suggestions as to how to get more active and back to some level of fitness. I dont care what the label on my clothes says, I just dont want to be overtaken by wee ladies with zimmer frames while I am out