I quite like weighted decline crunches for core strength. You can throw them in pretty easily on top of a set of 4 compound lifts. Try 3 x 10 and build up. I do 4 x 25 as it only takes 5 minutes or so, max.
Grab a weight plate (my girlfriend uses a 5kg but whatever works for you) and jump on the decline bench.
Any of the compound lifts will help your core, another which I really like are pull/chin ups, which you could do on the assisted machine if not quite ready for full bodyweight. Assisted dips would be good as well.
I quite like weighted decline crunches for core strength. You can throw them in pretty easily on top of a set of 4 compound lifts. Try 3 x 10 and build up. I do 4 x 25 as it only takes 5 minutes or so, max.
Grab a weight plate (my girlfriend uses a 5kg but whatever works for you) and jump on the decline bench.
Any of the compound lifts will help your core, another which I really like are pull/chin ups, which you could do on the assisted machine if not quite ready for full bodyweight. Assisted dips would be good as well.