Lynn’s team head into the round-three clash of the Women's Six Nations Championship at Ashton Gate Stadium as clear underdogs on Saturday.
England are the dominant force in the women’s game, reigning world champions and serial Six Nations Grand Slam winners, boasting a fully professional system and one of the deepest talent pools in international rugby.
By contrast, Wales remain in a slump, compared to their progress of a few years ago.
Despite encouraging passages in defeats to Scotland and France, they have struggled to maintain performance levels across the full 80 minutes — an issue Lynn has made central to his message ahead of their toughest assignment of the campaign.
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“We need to show the same intensity and resilience that we have shown in the opening two games against Scotland and France and do it for longer,” Lynn said.
“The grit and resilience we have shown and the ability to dig deep is an attribute we showed against France, and we will need against England.”
The scale of the task is not lost on the Wales camp.
England’s dominance in recent years has been underpinned by a long-established professional structure, a thriving domestic league and a winning culture that has seen them pull away from their Six Nations rivals.
“We are under no illusions of the challenge we face against the Red Roses. We are playing the world champions and Grand Slam champions in front of a sold-out Ashton Gate,” Lynn added.
“It doesn’t get bigger than that and England are the trailblazers in the women’s game and have stolen a march on all of us in the Six Nations.
“They have been professional longer than us, have their own domestic league and that is the reality of the challenge ahead of us.”
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That gap has been reflected in results. England have routinely posted commanding victories over Wales in recent meetings, often exposing issues around depth and game management — precisely the areas Lynn is targeting as his side looks to evolve.
Still, there have been signs of progress.
Wales showed resilience in patches against both Scotland and France, demonstrating defensive grit and flashes of attacking promise.
The challenge now, as Lynn has emphasised, is to extend those periods and turn competitiveness into sustained pressure.
“This is all about us building our performances and style of play and developing our identity as a team,” he said.
“These are the games you want to play and get excited about, and we will know where we stand after what we know will be a huge Test match.”
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Lynn has made two changes to his starting XV for the encounter in Bristol, with Bethan Lewis captaining the side in the absence of injured skipper Kate Williams.
Branwen Metcalfe is handed her first Six Nations start, while experienced scrum-half Keira Bevan comes into the line-up.
The pack remains largely unchanged, with props Gwenllian Pyrs and Sisilia Tuipulotu alongside hooker Kelsey Jones forming a settled front row.
Behind them, locks Gwen Crabb and Jorja Aiono continue their partnership.
In the backs, Lleucu George directs play from fly-half, with pace provided out wide by Jaz Joyce and Seren Singleton.
One of the most notable storylines is the return of Alisha Joyce, who is set to make a remarkable comeback just months after giving birth.
Her inclusion on the bench offers an emotional lift for the squad, particularly given her connection with partner and teammate Jaz Joyce.
“On behalf of all the players, coaches and staff, I cannot say how delighted we are to welcome Alisha back after the birth of Ralphie,” Lynn said.
“It’s a remarkable return to rugby, let alone the Test match arena, and Butch’s diligence and desire to wear the red of Wales again has been an inspiration to all of us.”
While the occasion — a sold-out crowd against the sport’s dominant side — provides a daunting backdrop, it also presents an opportunity.
For Wales, progress will not necessarily be measured solely by the result, but by whether they can match England’s physicality and maintain their performance levels deeper into the contest.
Wales squad (v England)
15 Kayleigh Powell (Harlequins) 30 caps, 10pts
14 Seren Singleton (Brython Thunder) 2 caps
13 Hannah Dallavalle (Gloucester/Hartpury) 71 caps, 25pts
12 Courtney Keight (Sale Sharks/Brython Thunder) 30 caps
11 Jasmine Joyce (Bristol Bears/Brython Thunder) 54 caps, 50pts
10 Lleucu George (Gloucester/Hartpury) 37 caps, 15pts
9 Keira Bevan (Bristol Bears) 80 caps, 147 pts;
1 Gwenllian Pyrs (Sale Sharks) 53 caps 20pts
2 Kelsey Jones (Gloucester/Hartpury) 54 caps, 25pts
3 Sisilia Tuipulotu (Gloucester/Hartpury/Brython Thunder) 32 caps, 40pts
4 Jorja Aiono (Brython Thunder) 2 caps
5 Gwen Crabb (Brython Thunder) 41 caps, 15 pts
6 Branwen Metcalfe (Brython Thunder) Three caps
7 Bethan Lewis (captain, Gloucester/Hartpury/ Gwalia Lightning) 63 caps, 30pts
8 Bryonie King (Gwalia Lightning) 14 caps
REPLACEMENTS:
16 Molly Reardon (Gwalia Lightning) 14 caps, 10pts
17 Maisie Davies (Gwalia Lightning/Bristol Bears) 14 caps
18 Donna Rose (Saracens) 39 caps, 10pts
19 Georgia Evans (Saracens) 45 caps, 10pts
20 Alisha Joyce (Brython Thunder/Bristol Bears) 54 caps, 35 points
21 Seren Lockwood (Brython Thunder/Gloucester/Hartpury) 6 caps
22 Jenna De Vera (Brython Thunder/Bristol Bears) 1 cap
23 Catherine Richards (Gwalia Lightning) 5 caps
