Testosterone | 心の筋トレ教室

About Testosterone

Testosterone | 心の筋トレ教室 operates a YouTube channel focused on mental fitness—the practice of training the mind with the same intentionality applied to physical training. The creator frames psychological resilience, stress management, and emotional well-being as learnable skills rather than innate traits. The channel's content spans cognitive frameworks for mental stability, habit formation to resist stress, motivation maintenance techniques, anger regulation, and philosophical perspectives on contentment and life direction.

The channel has published 283 videos and accumulated 4,181,747 total views across 87,600 subscribers. The creator's stated mission is to serve as a personal trainer for mental development, positioning the channel as a resource for both difficult periods and growth phases. The bio references an established presence beyond YouTube: 2.15 million followers on X (formerly Twitter) and 1 million cumulative book copies in circulation, suggesting a broader personal-development brand with multi-platform reach.

The content philosophy emphasizes that mental training, like physical training, follows reproducible principles. The creator acknowledges that progress is not linear—acceptance, rest, and reflection are framed as legitimate components of mental fitness, not failures. This positions the channel within the self-improvement and wellness space, but with explicit focus on psychological frameworks rather than fitness or nutrition alone.

Testosterone's estimated sponsorship rates

The estimated sponsorship rate for an integrated YouTube video placement ranges from $478 (low) to $1,196 (high), with a typical rate of $797. This estimate is based on the channel's subscriber count of 87,600 and algorithmic modeling; we do not yet have direct rate data from brand partnerships or community submissions.

The creator is classified in the low audience tier relative to the broader YouTube ecosystem, though the subscriber base is comparable to established health-niche peers. Dr. Mohamed Omar Yousif (84,300 subs) and Dr. Berg Hindi (79,900 subs) operate at similar scale, while 薬に頼らず体質改善 | たかだ先生 (91,500 subs) and Dr. Dev (96,200 subs) represent the upper boundary of this peer group.

Several factors influence the rate estimate. The Japanese market and mental-health niche typically command moderate CPM rates compared to finance or technology verticals. The creator's multi-platform presence—particularly the 2.15 million X followers and published books—may support premium positioning within the mental-wellness category, as brands can leverage cross-channel reach. However, without view-count history or direct advertiser data, the estimate reflects baseline algorithmic calibration. Brands considering partnership should evaluate the audience composition (Japanese-language, mental-health-focused) and engagement patterns against their target demographic and campaign objectives.

Who should partner with Testosterone?

The channel's 87,600 subscribers are primarily Japanese-language audiences interested in mental health, psychological resilience, and self-improvement. The content addresses stress management, emotional regulation, motivation, and life philosophy—positioning the channel within the broader wellness and personal-development category rather than clinical psychology or medical content.

Brand alignment opportunities span several categories: mental-health apps and digital wellness platforms; meditation and mindfulness software; productivity and habit-tracking tools; self-help publishing and educational courses; corporate wellness programs; and lifestyle brands emphasizing holistic well-being. The audience is likely receptive to products and services framed around psychological resilience, emotional intelligence, and sustainable behavior change.

The creator's established book sales (1 million copies) and X following (2.15 million) suggest an audience that engages across formats—video, written content, and social discussion. This indicates potential for brand partnerships that extend beyond single-video integrations, such as multi-format campaigns or affiliate relationships with educational platforms. The mental-fitness framing differentiates the channel from fitness-focused peers like Dr. Dev (96,200 subs) or 薬に頼らず体質改善 | たかだ先生 (91,500 subs), whose audiences may prioritize physical health outcomes. Testosterone's audience appears more oriented toward cognitive and emotional frameworks, making it suitable for brands targeting psychological well-being and personal-development verticals.

Testosterone's growth and performance

We have only a single snapshot of subscriber data, recorded on 2026-05-12 at 87,600 subscribers, with no prior measurement point to establish growth trajectory. The span between first and latest tracking is 1 day, resulting in a delta of 0 subscribers. This insufficient data window prevents meaningful analysis of subscriber velocity, seasonal patterns, or long-term growth trends.

To establish growth context, the channel's 4,181,747 total views across 283 published videos yields an average of approximately 14,800 views per video, suggesting consistent audience engagement. However, without historical snapshots spanning weeks or months, we cannot determine whether subscriber growth is accelerating, plateauing, or declining. Average views over the last 30 days are not yet available in our dataset.

Future tracking will enable analysis of growth patterns relative to content release frequency, seasonal trends in mental-health content consumption, and competitive positioning against peers in the health niche.

How our pricing estimate works for Testosterone

The rate estimate is generated algorithmically using the creator's subscriber count (87,600), niche-specific CPM benchmarks for health and mental-wellness content, and platform/format multipliers for YouTube video integrations. The estimate does not incorporate direct brand-partnership data, as we have zero community submissions for this creator. The low audience tier classification reflects subscriber count relative to the broader YouTube ecosystem; it does not indicate low engagement or brand suitability.

The estimate is calibrated against health-niche peers and regional market data for Japanese-language content. Actual rates depend on factors including audience demographics, engagement metrics, content category, brand fit, and negotiation. For a detailed explanation of the algorithmic model, multiplier assumptions, and CPM benchmarks, see the /methodology page. Brands should treat this estimate as a starting reference and conduct direct outreach to confirm current rates and availability.