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Home » Celebrity Workouts

John Krasinski Diet and Workout Program

Revealing the heavy-duty training and diet that went into the remarkable physique transformation of John Krasinski from The Office’s Jim Halpert to badass Jack Ryan. 

Written by Steve Theunissen, PT

Last Updated on12 May, 2022 | 1:36 AM EDT

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Of all the movie star transformations over the past few years, few have been as impressive as John Krasinski’s. No one could have ever imagined the dweeb Jim Halpert from The Office morphing into a ripped, muscular Jack Ryan in the Amazon series of the same name. Yet, that is precisely what he did.

In this article, we delve into the training and diet that helped Krasinski on his journey from The Office to Jack Ryan. 

Who is John Krasinski?

Full Name: John Burke Krasinski
Weight Height Age
200 pounds (90 kilograms) 6’3″ (192.02cm) 45 years
Date of Birth Birthplace Zodiac Sign
Oct. 20, 1979 Boston, Massachusetts Libra
John Krasinski
John Krasinski (image via @johnkrasinski)

John Krasinski was born on October 20th, 1979, in Boston, Massachusetts. His father was an internist, and his mother worked as a nurse. John is the youngest of three brothers. His heritage is Polish on his father’s side and Irish on his mother’s side. 

Acting Career

John’s first performance in front of an audience was when he played Daddy Warbucks in a production of the musical Annie in sixth grade. As a high school senior, he appeared in a play written by friend and future The Office co-star, B.J. Novak. 

After graduating from Newton South High School in 1997, John taught English in Costa Rica for six months. He then returned to the US to attend Brown University, majoring in English. He graduated in 2001.

After graduation, Krasinski attended the National Theater Institute in Connecticut. He also studied at the Royal Shakespeare Company in England, along with the Actor’s Center in New York. In 2000, Krasinski worked as an intern on Late Night With Conan O’Brien. After graduating from Brown, he moved to New York to pursue an acting career. He appeared in a few TV shows and plays. 

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Krasinski’s big break came in 2004 when he was cast in the US version of The Office. He appeared in every episode of the show’s nine-year run (2005-2013). During The Office years, Krasinski also appeared in a number of movies, including License to Wed (2007), Leatherheads (2008), and Something Borrowed (2011). In 2012, he starred with Matt Damon in Promised Land.

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A post shared by John Krasinski (@johnkrasinski)

In 2016, Krasinski played Jack Silva in the Michael Bay war movie 13 Hours: The Secret Soldiers of Benghazi. Bay’s film was the first time Krasinski had to get in shape for a role. He packed on muscle mass while shedding body fat for the movie. 

In 2018 Krasinski secured the role of Jack Ryan in the Amazon series of the same name. He is the fifth actor to play the role. At the time of this article’s publication, two seasons have been released, with the third season in production. 

John Krasinski Nutrition Program

Prior to getting serious about getting in shape for his roles, Krasinski was a committed foodie. He especially loved to dine at all-you-can-eat buffet restaurants. However, as soon as he signed the contract to star in 13 Hours, he put an end to his indulgent relationship with food. 

Krasinskis’ dieting discipline was the key driver in his spectacular body fat percentage drop from 25% to 9% in just four months. For that four-month period, he mainly ate lean protein and low carbohydrate vegetables. He also drank a lot of water (averaging about half a gallon each day).

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A post shared by John Krasinski (@johnkrasinski)

Check Out: Ms. Bikini Olympia Elisa Pecini Shares Inspirational Story Of Overcoming Eating Disorder To Become Champion

Here is what a typical day’s worth of eating looked like for John Krasinski during his transformation —

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Breakfast

  • Pudding made of 1/4 cup of almond milk, 2 frozen blended bananas, 3 scoops of casein protein powder, and 2 squares of cacao chocolate
  • Whole grain bread topped with peanut butter, almond butter, or jam
  • Green tea or coffee
  • Multivitamins

 Lunch

  • Brown rice
  • Lean protein
  • Green salad

 Dinner

  • Sweet potatoes
  • Chicken breast
  • Low carb veggies

Related: Jake Gyllenhaal Southpaw Workout & Diet Program

John Krasinski Workout Principles

Krasinki abides by the following training principles —

1. Compound movements are king 

The program was built around basic compound bodybuilding type exercises, such as the squat, pull-up, and bench press. 

2. If you’re on a deadline, get comfortable training twice a day

Krasinski trained twice per day. One workout focused on cardio for fat loss, while the other was all about building muscle. Furthermore, he trained five days a week, taking the weekends off.

3. HIIT functional training will get you shredded to the bone

Krasinski did a lot of intense metabolic training, including functional training with sleds and battle ropes. John favored HIIT-type cardio workouts but did mix it up with steady-state, alternating between the two.

4. Always be photoshoot ready

Since his role in 13 Hours: The Secret Soldiers of Benghazi, Krasinski tries to always stay within three weeks of being in action movie-ready shape.

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A post shared by John Krasinski (@johnkrasinski)

Must Read: HIIT vs. LISS Cardio: Which One Is Best for Fitness and Fat Loss?

John Krasinski Workout Program

As mentioned above, Krasinski did cardio and a weight workout every day, except for the weekends. The cardio sessions would alternate between LISS (low-intensity steady state) workouts on the rowing machine and HIIT (high-intensity interval training), also on the rowing machine. 

Krasinski preferred to use the rowing machine because it is a full-body workout machine. Unlike most cardio options, which are heavily lower body-centric, rowing works 80 percent of your muscles. Because it is a closed chain exercise, rowing is also very joint-friendly. 

Here is what Krasinski’s training looked like for his 13 Hours: The Secret Soldiers of Benghazi transformation —

Monday

  1. Cardio — HIIT rowing machine workout as follows:
    1. 2-minute warmup
    2. 20 seconds fast
    3. 10 seconds slow
    4. Repeat for 8 rounds
    5. 2-minute cool-down
  2. Weights
    1. Barbell Bench Press: 4 sets of 10,8,5,3 reps
    2. Close Grip Bench: 4 sets of 10,8,5,3 reps
    3. Incline Dumbbell Press: 3 sets of 10 reps
    4. Skull Crusher: 3 sets of 10 reps
    5. Chest Fly: 3 sets of 10 reps
    6. Tricep Overhead Extension (Cables or DB): 3 sets of 10 reps
    7. Hex Press: 3 sets of 10 reps
    8. Tricep Pushdown (Cable): 3 sets of 10 reps

Tuesday

  1. Cardio — Steady-state cardio on the rowing machine for 60 minutes.
  2. Weights
    1. Deadlift: 4 sets of 10,8,5,3 reps
    2. Dumbbell Bicep Curl: 4 sets of 10,8,5,3 reps
    3. Dumbbell Row: 3 sets of 10 reps
    4. Preacher Curl: 3 sets of 10 reps
    5. Cable Row (Close-Grip): 3 sets of 10 reps
    6. Hammer Curl (Cable): 3 sets of 10 reps
    7. Lateral Pull-Down: 3 sets of 10 reps
    8. Zottman Curl: 3 sets of 10 reps

Wednesday

  1. Cardio — HIIT rowing machine workout as follows:
    1. 2-minute warmup
    2. 20 seconds fast
    3. 10 seconds slow
    4. Repeat for 8 rounds
    5. 2-minute cool-down
  2. Weights
    1. Dips: 3 sets of 10 reps
    2. Pull-up: 3 sets of 10 reps
    3. Push-up: 3 sets of 10 reps
    4. Weighted Lunge: 3 sets of 10 reps
    5. Sit-up: 3 sets of 25 reps
    6. Wide-Grip Pull-Up: 3 sets of 5 reps
    7. Box Jump: 3 sets of 20 reps
    8. Weighted Plank: 3 sets of 60 seconds

Thursday

  1. Cardio — Steady-state cardio on the rowing machine for 60 minutes.
  2. Weights
    1. Barbell Squat: 4 sets of 10,8,5,3 reps
    2. Front Squat: 4 sets of 10,8,5,3 reps
    3. Thrusters: 3 sets of 10 reps
    4. Leg Press: 3 sets of 10 reps
    5. Weighted Step-Up: 3 sets of 10 reps
    6. Straight Leg Deadlift: 3 sets of 10 reps
    7. Calf Raise: 3 sets of 10 reps
    8. Hamstring Curl: 3 sets of 10 reps

Friday

  1. Cardio — HIIT rowing machine workout as follows:
    1. 2-minute warmup
    2. 20 seconds fast
    3. 10 seconds slow
    4. Repeat for 8 rounds
    5. 2-minute warm-down
  2. Weights
    1. Military Press: 4 sets of 10,8,5,3 reps
    2. Barbell Shrug: 4 sets of 10,8,5,3 reps
    3. Shoulder Fly: 3 sets of 10 reps
    4. Dumbbell Shrug: 3 sets of 10 reps
    5. Face Pull: 3 sets of 10 reps
    6. Arnold Press: 3 sets of 10 reps
    7. Shoulder Front Raise (Light w/ DB): 3 sets of 10 reps
    8. Power Clean: 3 sets of 10 reps

John Krasinski Supplement Regime

Krasinski isn’t big on supplements and prefers to get most of his nutrients from whole foods. The couple of supplements he uses include —

1. Protein Powder

John would take a whey protein isolate shake within about a half-hour of completing his workout each day. It helps replenish his depleted glycogen stores and provides amino acids for protein synthesis. He added almond butter and coconut oil to the shake for healthy fats. Each shake would include about 25 grams of protein.

2. Multivitamins

Krasinski took a multivitamin daily to ensure that he was meeting his micronutrient needs. It included omega-3 fatty acids, vitamin D, and zinc to boost his energy levels and reduce post-workout muscle soreness. 

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Wrapping Up

John Krasinski’s transformation from his role in The Office to convincingly playing badass roles in 13 Hours: The Secret Soldiers of Benghazi and Jack Ryan gives hope to all guys who don’t possess the genetics of Chris Hemsworth or Arnold Schwarzenegger. 

Each of us can draw inspiration from what Krasinski has achieved through his transformation regimen and make use of his methods to carve our dream physique. 


If you have any questions or need further clarification about this article, please leave a comment below, and Steve will get back to you as soon as possible.

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Steve Theunissen, PT

Steve Theunissen, PT

Steve Theunissen is a former gym owner and personal trainer and is the author of six hardcopy books and more than a hundred ebooks on the topics of bodybuilding, fitness and fat loss. Steve also writes history books with a focus on the history of warfare. He is married and has two daughters. Steve hold the following certifications from the International Sports Sciences Association: * Certified Personal Trainer * Fitness Nutrition Certification * Specialist in Group Fitness & Guided Study * Strength & Conditioning Certification * Sports Nutrition Certification * Transformation Specialist & Guided Study

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