: Best way to achieve muscle activation in the lower abs? I have back problems and need to work on my posture, one element is the lower ab to 'pull' my lower back into a more upright position (I tend to fall into a hollow back).

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Okay - you're asking a challenging question, without diagnosis etc. it's hard to answer, regardless I'll give it a shot:

Let's get you a solid core first: hollow body hold, planks (back, front and side), L-Raise progression (aiming for straddle raises for hip and lumbar stability)

Let's open up your hips & associated connectives: Seated Cross Legged Piriformis Stretch, Butterfly Stretch, Front Lunge, Couch Stretch, Standing Pike.

Let's make your brain & neural pathways aware that your hips can be rotated: Cat pose, Camel pose, Half king pigeon (this was all Yoga btw)

So now you physically can have better posture you have to do it & then ultimately you want your body to do it for you. This should get your primed.

By the way, as much as I hate this website... if you care about activation then check out this article.

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I would definitely start doing a lot of leg and lower body engaged abdominal workouts. These workouts will obviously target your lower abs. The key of trying to support your back at the same time with long lasting contraction would be more associated with the sets and reps you're choosing to execute. In my experience of training my lower abdomen, I've found the most success in weighted and un-weighted leg raises. These are a great exercise that target the lower abs in all areas with some variations. I've included some links to some great leg-based ab workouts below.
www.bodybuilding.com/exercises/detail/view/name/decline-reverse-crunch http://www.bodybuilding.com/exercises/detail/view/name/flat-bench-lying-leg-raise www.bodybuilding.com/exercises/detail/view/name/hanging-leg-raise