Back is feeling better. Finished off my lower-body yesterday:

Reverse hyper single leg curls: 6 plates x 3 x 15

10 hanging leg raises, 2 sets of 10 with the ab wheel (kneeling), 30 crunches

This morning right after waking up, I jogged out to Heart Attack Hill and did 1 backwards uphill jog followed by 1 sprint to the top.