Most People Gain Weight on Cruises, but He Built Muscle and Burned Fat Instead. Here’s the 8-Rule System He Followed to Come Back Leaner Than He Left

Most people board a cruise with one thing in mind—indulgence. It’s not uncommon to gain 5 to 10 pounds in just a week at sea.

But what if you went the other way? In a bold experiment dubbed “The Fitness Cruise,” YouTuber Will Tennyson set out to defy the odds by prioritizing health, workouts, and dietary discipline on a trip where everything screams excess.

Can you really come back healthier than you left? Here’s how it all went down—and what anyone can learn from it.

The Fitness Cruise Rules: Setting the Tone for Success

Before stepping onto the ship, Will weighed in at 192.1 lbs and declared this vacation a mission: get “leaner, meaner, and more jacked.” Alongside his wife and best friend Katie, they created four core rules to navigate the trip:

1. No repeating meals. This eliminated the mindless fallback to chicken and rice daily.
2. Visit the buffet at least once per day—but “do your best.”
3. Take only stairs. With their room on the 15th deck, this was no joke.
4. Work out every day. Non-negotiable.

These rules laid the foundation for what would become a successful health-focused cruise experience—without missing out on the fun entirely.

Cruise Temptations vs. Smart Choices

Onboard indulgence starts the moment you board. The scent of hot dogs and hamburgers welcomes most passengers and free-flowing champagne is served in-suite. Will and Katie, however, politely declined.

“The only thing we’re getting drunk on is aspartame,” Will joked while sipping on Coke Zeros. It was a light-hearted way to stay off high-calorie alcoholic beverages that quickly add up.

Still, they weren’t perfect—and that’s okay. Cookies appeared in the room courtesy of their cheerful butler William (“He’s not a butler…he’s a double agent”), and an OMG caramel butterscotch cheesecake at dinner proved too tempting to ignore. Their approach? Share items and savor, not splurge.

Structuring Meals Wisely, Even at the Buffet

The buffet can quickly derail the best intentions. Will’s smart strategy was to create a two-part plan for buffet domination:

• Plate one: Start with lean proteins and half a plate of salad or veggies to fill up.
• Plate two: A “funsies” plate with small portions of indulgent items—pizza, mac and cheese, tacos—by choice, not by guilt.

“I think I’m healthier on the cruise than I am off it,” he remarked. That’s what structure does—it creates sustainable enjoyment without chaos.

Fitness Onboard: Empty Gyms and Full-Body Demolition

Surprisingly, the cruise ship’s gym—despite serving 2,500 people—was nearly empty. This became a goldmine for Will and Katie, who trained daily with zero wait times.

Highlights included:

• Bench pressing 305 lbs
• Lat pulldowns with a seatbelt (“maybe in case the ocean gets rough”)
• Lateral raises, arm supersets, and pull-ups to failure

The gym featured plenty of cardio equipment—treadmills, recumbent bikes, ellipticals—but limited weights. Will made it work with functional, high-volume exercises, including 100 lateral raises to “never be too wide.”

Cardio That’s Actually Fun (Yes, Really)

Rather than isolating gym time for cardio, they got clever. A deck run became both entertainment and fitness, especially after a highly caffeinated breakfast (“We got to outrun the runs, babe”).

295 active calories burned later and a short post-run basketball session meant they’d cruised through their movement goals while keeping energy high and stress low.

Recovery Counts: Massage and Relaxation

“It’s not always about muscle breakdown—we need to recover,” he noted while booking a Swedish massage. A game-changing decision complemented their intense workouts. Deep tissue focus (and a surprisingly effective eye-fix add-on) allowed sore muscles to recover and kept performance up.

Protein First, Dessert Second (If At All)

One reason so many gain ship weight? Lack of protein. But not for Will. With daily targets of 200 grams and tools like the Macro Factor app and room-delivered protein shakes, hitting that mark became easy.

“If you can’t get your protein in, you don’t deserve the gains,” he said with a grin.

Even dinner at upscale restaurants was optimized. Shrimp appetizers, lean steaks, grilled chicken, and avoiding cream-based sauces helped maintain high protein intake with lower calorie loads—even when sharing desserts like the cheesecake.

Steps Matter: Cruise Ships Are Built for Walking

Between walking the halls, climbing stairs (remember: 15 decks up daily), and getting off at Great Stirrup Cay for a 5,000-step beach trek, physical activity was nonstop. Even walking on sand—the ultimate calf workout—was used strategically to rack up calorie burn.

“Walking on the beach is 3x the effort. Current steps: 6,044. Time to celebrate with a virgin cocktail,” he quipped.

Instead of throwing in the towel after a long walk, they adjusted their meals at the island buffet—removing mayo-heavy toppings, choosing grilled veggies, and sealing the deal with a shared Caribbean coconut bar. Indulgence, just not insanity.

Progress Check: Did He Actually Get Leaner?

By day three, it was time to check in. Post-workout physique updates showed no signs of bloat or backtracking—just more definition, thanks to daily lifts, smart nutrition, and consistent movement.

“I think I’m starting to look better,” Will said. “Maybe I should live on the boat.”

Lessons from the Cruise: Balance Beats All

In hindsight, this wasn’t about restriction—it was about strategy. Portion control, protein prioritization, structured workouts, and smarter indulgence made all the difference. Will enjoyed everything he wanted without excess.

“People think they’re missing out if they don’t go all-in. But having a few bites, then stopping—that’s powerful,” he reflected.

What You Can Do: 8 Cruise Fitness Tips That Actually Work

Whether you’re prepping for your first vacation or trying to undo years of naughty habits, these takeaways can reset the game:

• Make rules, not restrictions: Set parameters that allow flexibility—like not eating the same meal twice.
• Take the stairs: Every extra step counts and adds up fast.
• Lift daily: Prioritize intensity over duration. Hit a full-body pump.
• Start meals with protein and fiber: That first plate determines the second.
• Practice mindful indulgence: Enjoy dessert, but share it. Savor, don’t binge.
• Hydrate smartly: Zero-calorie drinks like Coke Zero help curb cravings.
• Track loosely but consistently: Use a macro-tracking app even on vacation to stay honest.
• Recover strategically: Prioritize sleep and include restorative activities like massages or stretching.

Final Verdict: Can You Get Fitter on a Cruise?

Absolutely. Will Tennyson proved that with smart planning and a positive mindset, a cruise can be an opportunity to gain—not weight—but confidence, momentum, and real muscle.

“It’s not about guilt. It’s about control. And I never felt like I missed out,” he said. “I had fun, I enjoyed myself, and I still made gains.”

If you’re considering ditching your goals on your next cruise, think again. With just a little structure, you could leave stronger, more energized, and proud of how far you’ve come.