I have the same problem. What I've found really useful is this simple exercise: hang from the pull up bar (like you do when preparing for pull-ups), lift both of your legs until they make 90 degree angle with your back, then slowly lower them down; repeat as many times as you can, but 10-20 repetitions daily after work are usually enough for me. Another simple exercise is a little less effective, but doesn't require any equipment: stand upright your back, shoulders and heels touching the wall, extend your hands forward then do normal squats.

The ladder works pretty well, it starts out so easy that it's almost boring but gets quite some bite when you progress.

I do the 5BX myself though (where the ladder is based on), as I mentioned in an earlier comment :)

Yeah, I'm having a problem with the boring part, so really hoping I don't lose focus. :)

Just keep it up for a few weeks and it becomes a habit. It's now the first thing I do every morning.

Protip: Make (or find and print) a calendar and hang it in a visible spot. Put an X every day you do the exercises, and then it's just a matter of not breaking the chain :)

I will try that! Thanks.