Exercise! I think I was fit in my late 20s but now I'm in my late 30s, and two difficult pregnancies and births, raising small children and a moderately serious injury have taken their toll. Now I'm working out at home and have been most days for the last 3 weeks, some HIIT, full body intervals, core, stretching. I don't feel like I'm getting any fitter even though I've sweated my tits off, mostly I just feel a bit achy and tired! When, if ever, does this start feeling good?!
Disclaimer - lighthearted! Also the exercise has helped me not go insane at home so I'll carry on.