Donnie Thompson "Super D" does some cool ankle and calf exercises with Flex Bands. Check out " super d ankle secrets" and "flexion your ankles."
Marryann Berry has a few recent articles on Tnation with some good moves/drills.
Then there are about a million articles about posture/mobility here on too.
In my opinion, its best to try 2 or 3 little mobility/activation type moves for each area you're struggling with. Some will be too easy, or too hard. But then you'll find that perfect drill, that does just what you want. Once you have a few good moves, you can work out your own super effective mobility routine. After like 2-3 weeks of doing that stuff a couple times a day, the moves start to feel bad, and don't work so well.
So 1 series could be...
-Band Pull Aparts/Band Dislocates for upper back/shoulders/chest
-Hip Hikes and Half Kneeling Hip Flexor Stretch for quads and hips
-Band ankle exercises, then goblet squat bottom position stretch.
After a couple weeks, when this stuff bores you out of your mind you can switch too
-Prone trap raises and Scarecrows
-Clamshells and Terminal Knee Extensions
-Glute bridges and b.w. calf raises on the floor.