Longest congratulations on your new baby nephew, first boy in the family too 
Hedgehog forget last night, and try and find ways that will stop you drinking in the evening. can you find something to motivate you to get up early in the morning? I forget how old your DC are, but if they are old enough to get them selves up and have breakfast on their own could you go out for a walk or run in the morning? Or set your alarm and do exercises (I used to do that when my DC were young). It isn't easy being a single parent. But there are ways to have some 'me' time if you plan.
Flossie Hugs, you have a lot on your plate.
Frouby can you find a core class during the day when there are less likely to be triathletes? I imagine peak time for them is early morning, lunchtime or evening. What about swimming, that is great core exercise?
NC4 Trying a new class each week is an excellent idea.
Water I hope you are recovered after your non athletic sex session 
Dion glad DD is better and well done on Day 1
I failed last night, but only had 2 glasses to be sociable with DP because he is away until Thursday or Friday, so I should be AF for the rest of the week. He has gone to pick up his mad cousin and her daughter who has hasn't seen for 45 years as her sister wants her to rent our new little house. She lives 900kms away so DP left this morning with a van to pick them and their belongings plus 4 cats up. At least it will be easier to look after her here, she has severe paranoia, thinks everyone wants to kill her and therefore lives as a recluse, but refuses to be treated professionally so not much can be done.