Back pain

^ Agree. Core is... well the all seeing... being... God... ?!

Have had a back problem since I was 15, and have had a disc buldge, 3 times, mostly after pregnancy, when muscles and ligaments are soft and picking up stuff the wrong way happens.
I swim alot, and have a very strong core, literally just from swimming. (not breast stroke though = bad for lower back)

You must do what the physio says and keep your core in mind all the time.
Also stretches, especially for cyclists;
Ham strings a must !!!
Glutes a must.
Hip-flexors a must.
Quads a must.
Constantly engaging stomach muscles, even whilst sitting. Dont slouch or let it sag :)
It will get better with time. It just needs lots of constant looking after and it will in return look after you.

All this ^... My ten minute morning routine:
• hamstrings
• quads
• swan stretch
• shoulder bridge
• plank