"It's tough, you can obviously train with a wet ball. We haven't had a lot of training with the nature of this series being so close together, it's just: play, travel day, play, travel day, play again.
"So there's not a lot of training so I think the guys just have to find a way."
Despite already conceding the series to India, Southee says his side still have everything to play for in their third encounter on Monday.
"The guys have got one last push, there's a number of guys going home after this next game so hopefully we can finish the tour on a high.
"It's another opportunity to represent your country, so I don't think you need any extra motivation to get yourself up."
The fast-paced nature of this tour continues next week as, after Monday's T20 match, the Black Caps will attempt to slow their heart rates to begin the first of two test matches on Thursday.
The side has never won a test series in India, so history beckons for the reigning World Test Championship team - while revenge is in the minds of the Indian squad after it lost that title to the Kiwis earlier this year.