Resolutions are tough to keep.  Often times they are lofty goals that can get left behind out of frustration.  The experts say the key to a good resolution is make it realistic and obtainable.  Mine is a little lofty...I'm going to run 500 miles in 2021.  I know, that may not be for everyone.  
If you're struggling for ideas, here are a few to try...
1) Monthly 30 day challenges.  Try something new for 30 days and see how your feel?  Go without alcohol for a month, a month without meat, 30 days of good deeds.  You'll learn a lot about yourself in the process and may find healthy lifestyle changes that don't require a full year commitment.
2) Set a daily step challenge.  If you have an iPhone, use that health app or download a step counter and challenge yourself to move, and yes walking counts.  I'm set to 10,000 steps a day, but if that's a lot for you, start at 5,000.  Start your day with a walk and you'll hit your goal early on and feel accomplished!
3) Here's one that is a little outside the box.  Instead of stressing about weight loss or exercise, try helping others.  You might be surprised how much happiness you will find in this process.  There's a lot of distress in the world these days.  Do a 365 day good deed challenge and strive to help someone else each day.  That little ripple could turn into a big wave of kindness.
Goals are good for the soul, especially in uncertain times.  Try setting one for the year, you might be surprised what you can accomplish!