Fortitude, also marketed as Thunivu – No Guts No Glory) is a 2023 Indian Tamil-language heist action thriller film written and directed by H. Vinoth, and produced by Boney Kapoor under Bayview Projects LLP and Zee Studios.

The film stars Ajith Kumar, alongside Manju Warrier, Samuthirakani, John Kokken, Ajay and Veera.

It follows Dark Devil and his team who forms a plan and commit a bank heist to find the corporate looted people's money.

Ramachandran confesses that he along with his childhood friend Shyam, the Tamil Nadu Branch Head of Your Bank, planned the heist.

Radha and his gang join and assist Dark Devil after hearing Ramachandran's confession through bugs planted on Dayalan's base.

Krish arrives and reveals that the third team was hired by him and tells them to destroy the bank's chest with explosives with hostages inside.

They all travelled to Araku Valley to arrange their marriage and celebrate, but they were ambushed by assailants sent by Krish and Shyam, who feared that they would reveal their heist plan to others.

Jijo and Achara got killed, but Dark Devil and Kanmani managed to escape, and the killers faked their deaths for the rest of their real money.

The duo reached the house of an old couple, who tended their wounds and revealed about his son Kavin, an honest bank official who wanted to return the money to the people who invested in mutual funds.

After the revelation, Dark Devil defeats Krish and his team, where he forces him on live to reveal his financial scam of the ₹25,000 crore, which was invested in the mutual funds, and the atrocities committed against people by the bank officials.

Shyam, who was made to wear a bomb vest, is sent to Dayalan, where he reveals everything about the heist and Krish's involvement in it before he is killed by Kanmani's phone call.

Sunil confesses that he invested in 10 companies belonging to Krish and reveals that the ₹30,000 crore is in the bank's secret chest locker.

With the help of a mole in the media, Krish falsely frames Dark Devil and his team as terrorists and cuts the live telecast.

A chase ensues where Dark Devil, Kanmani, and the rest of their team shoot the commandos and coast guards, using an M2 Browning.

In the post-credits scene, Dark Devil and Kanmani fake their deaths and escape using sea scooters and reach their boat, settling in international waters.

Ajith Kumar's 60th film, Valimai (2022) under the direction of H. Vinoth and produced by Boney Kapoor, faced several production delays due to the COVID-19 pandemic.

[13] Initially Ajith planned for collaborating with a different director, but agreed to join with Vinoth after watching the rough edit of Valimai.

[18][19] Vinoth recruited cinematographer Nirav Shah and editor Vijay Velukutty, who worked on Valimai, while music composer Ghibran and art director Milan, were signed on.

Vinoth wanted to cast an actress closer to Ajith's age and chose Warrier as he felt that "audiences would expect a strong character from her as she's a terrific performer.

"[23] The same month, John Kokken,[28][29] and Veera signed the film,[30] along with Samuthirakani[31] and Mahanadi Shankar,[32] who collaborates with Ajith after 20 years since Dheena (2001).

[citation needed] Shaam was approached to play a negative role, but declined due to scheduling conflicts with Varisu.

[46] In July 2022, fans leaked stills of the bank set from the film, which had resembled a "french style building".

[56][57] On 16 October, patchwork shooting for the film progressed in Chennai, where a body double of Ajith had shot for the robbery sequence.

[86] The Tamil Nadu distribution rights of the film were acquired by Red Giant Movies,[citation needed] through profit-sharing basis.

[citation needed] The Andhra Pradesh and Telangana distribution rights of the film were acquired by Dil Raju under the banner Radha Krishna Entertainments and Ivy Productions.

[98] M. Suganth of The Times of India gave 3 out of 5 stars and wrote "Despite raising many relevant questions about the operations of our financial institutions and the impact that has on the common man, the film’s refusal to show it as something that affected the protagonist directly makes it impossible to root for him whole-heartedly.

[100] Haricharan Pudipeddi of Hindustan Times wrote "With each collaboration, H Vinoth has managed to bring out something refreshing with respect to Ajith’s performance.

[102] Princy Alexandar of Onmanorama wrote "The message is also definitely an eye-opener for banks and corporates, but is not striking enough as the aim seems to be only to appease Ajith fans.

[103] Thinkal Menon of OTT Play gave 3 out of 5 stars and wrote "Thunivu, undoubtedly, is a treat for Ajith fans and action lovers.

[citation needed] Sudhir Srinivasan of Cinema Express gave the film 3 out of 5 stars and wrote "How much you like Thunivu depends on how much you are willing to forgive its weak portions—and of course, how much you have missed seeing Ajith Kumar enjoy breaking bad".