Trying to remember what episode...

[SamuraiOdin]

I stopped watching Shippuden a while ago, and recently got in the mood to pick it back up. When I stopped watching, Naruto had just started working on improving his Rasengan. Around what episode was that?

[Marik]

Did you stop before the Sora filler? He resumes his training in Episode 73, which is after the filler.

[SamuraiOdin]

Thanks Marik. I don't remember the filler, but I'll just pick it up at 73. No harm in skipping the filler :D