I've gone from walking 80minutes/day and doing 16-8 'fasting' to eating comfort foods and barely leaving the house. Principally for me I was able to use getting to work as a motivator to exercise (and everything else fell in to place to some extent); now work is in the bedroom. It's a problem principally of depression/lack of motivation; but one that I was managing prior to lockdown.

Experiences are so varied across the board. It wouldn't surprise me if overall people, like me, were worse off in general health terms.