core training is simple- find a program you can tolerate and stick to it- day after day after day after day. . . . you get what I mean here? There is no quick fix- find one or two exercises that you can (and will) do- I have a very simple routine that I do every other day. Old landscapers have one thing in common- BAD BACKS
I vowed years ago to do all I could to avoid that. One of my ways is to keep doing core work.
I hate sit ups- they hurt my neck and lower back- I do roman chair sit ups on my weight bench- slow hard curls- YUCK!!! But they work- I then do leg lifts on the bench as well. Keep it simple and stick to it
Jason