Random exercises
There are not so well classified and can use heavyweights if desired. Side bends are
good to train regularly just because they really strengthen the lower back and help
protect against injuries. Shrugs can be tossed in the middle of a lot of movements
for free and strengthen the shoulders. The others are nice amusements, meaning
you can throw them in for chaos and if they seem a bit tricky, do them regularly
for a few weeks until the novelty wears off.
Figure eights
Shrugs
Side bends
Turkish get up