Anggriawan Sugianto

It was supposed to be the grand finale. The last battle in my 2025 ultra trail saga—a year packed with challenge and grit. Three 100K ultras in eight weeks. One race each month. I was tired, yes, but more than that, I was determined. This was the moment to seal the deal. Siksorogo Lawu Ultra 80K. The last dance of the year.

Campground Sekipan, Tawangmangu

I’m no stranger to this race. Not at all. My story with SLU began in 2023, a modest 30K that introduced me gently to the wild trails. It didn’t end there. I came back stronger, wilder, wetter in 2024. The rain never let up; it poured like the sky was determined to wash away every ounce of my hope. I slipped, I tripped, I fought. Yet I finished. Barely.

The 2024 race stats tell a brutal story. From 44 starters in the 120K only 6 finished, a gut-wrenching 14%. The 80K field saw just 51 of 145 make it through, about 35%. And the 50K? Even that, with nearly half dropping out. The median finish times crept close to cut-off, inching like shadows waiting to claim the weak.

Flag-off times laid out a rhythm, a precarious dance with darkness and daylight. Midnight for the longest, early mornings for the rest. These are not casual starts. They are invitations to suffer under the indifferent stars.

Then came 2025.

This year, something had shifted. The numbers were better. 23 finishers of 57 in the 120K, that’s 40%. The 80K grew to 65% finishers, and the 50K even higher. More runners standing tall, more stories of grit written into mountain dust.

Even the median finish times edged slower than 2024, but still comfortably under the cut-offs. That small difference means everything. Because every second counts when the body screams for mercy.

And, yes, the flag-off times in 2025 changed too. The 120K started on Friday night, earlier than before, the 80K at midnight, chasing night’s last breath, and the 50K at 5 a.m. No more leisurely dawn departures. This was battle mode.

Okay, let's be honest. After running two 100-kilometer ultra-trail races in just five weeks, my body should have been officially on strike. Most people would be horizontal, maybe with a nice warm compress and a long, philosophical stare at their ceiling.

BTS Ultra: The most beautiful ultra-race I ever run

Yet, here I was, standing at the BTS Ultra start line. This was the third, and final, monster in my slightly mad, self-imposed trilogy. The mountain air was sharp and cold, but also buzzing with a strange, electric energy. I expected a full choir of aches and doubts to greet me, a symphony of 'what ifs' and 'why did I dos' louder than a rock concert.

But instead? Silence. A surprising calm hummed beneath my skin. There was no overwhelming tiredness from BDG Ultra or Trans Jeju, those two beasts I'd already wrestled. Three full weeks I’d poured into recovery, focused entirely on healing, on preparing for Bromo’s unique challenge. My Amazfit T-Rex 3 Pro had quietly tracked every training session, every recovery nap (almost!), giving me solid, data-backed confidence. It paid off. My internal optimists, usually a quiet bunch, were actually winning the argument for once.

Even with a third 100K looming, a crazy big task for most, and frankly, a bit bonkers for anyone, stress felt like a distant rumor. This wasn't just another race dot on my calendar. It was the legend. This famous 100K race, winding through ancient volcanic areas and tough peaks, felt less like a course and more like a sacred landscape where volcanoes stand guard. Where the earth breathes old fire and wisdom.

Third ultra trail 100K in 8 weeks

This race, I truly believe, is the most beautiful ultra-trail race I have ever run. Its natural beauty just pulls you in. Huge peaks touching the sky, the fresh, cold mountain air that wakes you up, the deep quiet before dawn that feels like the world is holding its breath. 

The race started at midnight. It was like a silent river of lights flowing from Artotel Cabin Bromo into the huge, dark night. My usual easy pace settled into a steady, calm rhythm. A quiet chat with the trail itself. We reached B29, a part that's known for being narrow. It’s a slow, careful shuffle up a steep hill, a forced lesson in working together. After that, the path went towards Ranu Pane. This part was sometimes "annoying" with its sunken tracks from motorbikes. Each careful step was a dance to avoid twisting an ankle, but my ASICS Gel-Trabuco 13 shoes, bless their grippy soles, held firm.

B29 Climb at Night

Then, the reward: Ranu Kumbolo (km 25). Even if its famous beauty was hidden in morning fog, its full glory veiled, just being near that calm lake was amazing. It felt like walking into a painting, a quick, dreamy moment of peace before the trail turned, going back to Ranu Pane. It was a short, beautiful break, a quiet promise of what was beyond the clouds.

Sebagai seorang pegiat ultra-endurance sport, yang telah menyelesaikan 9x marathon sejak 2023 dan baru saja menyelesaikan 100K ultra trail di BDG Ultra dan Trans Jeju by UTMB, saya menyadari betul krusialnya peran teknologi pendukung. Selama empat tahun terakhir, smartwatch lama saya telah menjadi instrumen esensial. Namun, di tengah tuntutan ultra trail race yang makin intens, saya mulai mengidentifikasi beberapa pain points:

1. Daya Tahan Baterai: Kebutuhan untuk mengisi daya di setiap checkpoint menjadi sebuah additional burden yang tidak ideal.
2. Navigasi: Fungsionalitas breadcrumb yang terbatas seringkali kurang memadai untuk jalur ultra trail yang kompleks, berpotensi menyebabkan nyasar di tengah hutan.
3. Visibilitas Layar: Layar yang relatif redup saat lari siang di bawah terik matahari mempersulit pembacaan data.

Tiga pain points tersebut membawa saya untuk mengeksplorasi solusi yang lebih optimal, hingga akhirnya menemukan Amazfit T-Rex 3 Pro. Smartwatch ini menarik perhatian saya karena menawarkan berbagai fitur flagship yang umumnya ditemukan pada segmen harga lebih tinggi. Artikel ini akan menganalisis secara objektif, apakah Amazfit T-Rex 3 Pro benar-benar memberikan nilai lebih dibandingkan pesaing selevelnya, seperti Fenix 8 atau Apex 2 Pro, khususnya dari perspektif seorang ultra trail runner.

Baterai T-Rex 3 Pro masih 18% setelah dipakai ultra trail 100K, lanjut tidur dan recovery walk.

⚠️ DISCLOSURE: Unit Amazfit T-Rex 3 Pro yang saya gunakan ini adalah dukungan dari Amazfit Indonesia untuk persiapan dan pengujian di ultra trail race 100K di TransJeju by UTMB 2025. Penting untuk ditekankan bahwa analisis ini bersifat 100% objektif, tidak berbayar, dan murni berdasarkan pengalaman pribadi saya di lapangan.

Spesifikasi Teknis Amazfit T-Rex 3 Pro

Sebelum membahas user experience, mari kita telaah data spesifikasi Amazfit T-Rex 3 Pro. Angka-angka ini menunjukkan bagaimana smartwatch ini serius menantang smartwatch flagship lain yang harganya bisa dua hingga tiga kali lipat:

• Harga: Rp 6.599.000 (Cek promonya di Shopee atau Tokopedia)
• Navigasi: Peta Offline
• GPS: Dual-Band GNSS (6 Satelit)
• Baterai (Mode GPS Akurat): Hingga 47 jam
• Layar: AMOLED 1.5 inchi (Sapphire)
• Flashlight: LED Bawaan
• Material Bezel: Titanium Grade 5