Three young, uncapped players have been included in the Wales squad, with Lynn saying scrum-half Seren Lockwood, prop Katherine Baverstock and lock Tilly Vucaj all have a chance of making it to the World Cup that begins for Wales against Scotland in Salford on Saturday, 23 August.
And he hailed the return of prop Sisilia Tuipulotu, who has not played since undergoing hamstring surgery in February.
Lock Natalia John (calf) and centres Kerin Lake (shoulder) and Hannah Bluck (calf) are missing through injury, though none is thought to be at risk of missing the World Cup, where Wales will also face Fiji and Canada.
The trio's recovery will continue at home ,where Lynn has so far overseen a gruelling fitness regime having identified fitness and discipline as issues following a review of the Six Nations campaign.
It has included sand dune running at Merthyr Mawr, training in dojos under the supervision of a new 'collision coach', former Wigan and Wales rugby league international Ben Flower, as well as military training with the Royal Welsh regiment.
"I learnt a lot in that Six Nations campaign and the big thing was we needed to work harder," Lynn said, who felt accuracy dropped off in games.
"Everything about us now is building this identity and making sure that we are competitive and we're a hard team to beat and we work hard for each other.
"Players and staff have been held accountable and we're in a good place to go to Australia where it will be a challenge. We're not going to be the finished article, but everything will be building going into Scotland."
Wales have lost their previous two games against Australia following their maiden victory over the Wallaroos in Newport in September 2024.
Lynn, though, played down the debatable choice of travelling 10,000 miles for two Tests in the space of six days to prepare for a tournament in England.
Asked if it was ideal preparation, Lynn said: "It is what it is, and we're going to embrace it."
He added: "It was booked before I took on the role, but I'm getting excited. We're playing Australia in Australia and it'll be a great opportunity for us as a group to spend valuable time with each other."
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