Questions & Answers about Li pli bone iras, ekde kiam ŝi komencis masaĝi lian kokson.
Both are possible. Esperanto word order is fairly flexible, and pli bone iras puts a little more focus on better.
- Li iras pli bone = He walks/goes better.
- Li pli bone iras = He walks/goes better, with better slightly emphasized.
A learner will probably hear Li iras pli bone more often because it feels more neutral.
Literally, iras means goes. But in context, it can naturally mean walks or gets around.
Because the sentence mentions massaging his hip, Li pli bone iras most likely means:
- he walks better
- he is moving around better
So this is a good example of Esperanto using a general verb where English might prefer a more specific one.