Sophie Macfie's 1.63M followers are mostly watching plant content—here's why fitness brands are walking past her

1.63M followers sounds impressive—until you check the content mix

Sophie Macfie (@sophsplantkitchen) has 1.63 million Instagram followers. She is a bestselling author and qualified personal trainer based in London. On paper, she looks like the dream ambassador for any fitness brand targeting the UK market.

But here is the number that matters more: 24%. That is the percentage of her content that actually relates to fitness. The rest is recipes, lifestyle shots, book promotions, and personal updates. She is a lifestyle creator who happens to be a PT—not a fitness creator who happens to have a life.

This gap between follower count and niche relevance is exactly what trips up sales teams and brand managers who rely on vanity metrics. You book a creator with 1.6 million followers expecting a fitness audience. What you get is a general audience that followed her for vegan brownies.

Modash.io published a list of 95 London-based fitness influencers—38 on Instagram, 57 on TikTok—and the data tells a clear story. Follower count alone is a trap. Content purity is the real signal.

Content purity: the metric your outreach process is probably ignoring

Content purity measures how much of a creator's output falls within a specific niche. For fitness, it is the percentage of posts tagged, captioned, or visually centred on exercise, nutrition, or training.

ABBIE DENNISON (@abbiedennisonfit) has 554.1K Instagram followers—roughly one-third of Sophie Macfie's count. But her fitness content purity is 93%. She is sponsored by Gymshark (code 'ABBIE10') and ESN (code 'ABBIE'). Her next event is Berlin HYROX on 28 May 2026. Every post reinforces her position as a fitness athlete, not a general influencer who occasionally works out.

If you are a brand selling protein powder, gym wear, or recovery tools, which creator delivers better ROI? The one with 1.6 million followers who posts about fitness once a week, or the one with 554K followers whose audience expects fitness content every single time?

The answer seems obvious. Yet most outreach teams still filter by follower count first and content mix second—if they check it at all. That is a pipeline problem, not a people problem.

How to score content purity without manual scrolling

You do not need to spend hours auditing every creator's feed. Tools like Modash already surface content purity percentages. The challenge is integrating that data into your outreach workflow before you send the first email.

At MiraReach, we see sales teams waste weeks chasing creators who look good on paper but deliver poor alignment. The fix is simple: build a scoring model that weights content purity at least as heavily as follower count. If a creator has under 30% niche content, they should not make your shortlist unless they have a specific campaign that matches their actual mix.

For example, Sophie Macfie's 24% fitness purity means she might work for a broad wellness campaign that includes nutrition and lifestyle. But she is a poor fit for a hardcore gym equipment launch. ABBIE DENNISON's 93% purity makes her ideal for the opposite brief.

The London fitness creator landscape: Instagram vs TikTok

The Modash list covers 95 creators total. Instagram dominates with 38, but TikTok is close behind at 57. The platform split matters because audience behaviour differs significantly.

Emma Petersen (@thefitlondoner) has 466.1K TikTok followers and 46% fitness content purity. She promotes her book 'Healthy-ish High Protein'—a title that signals the same blend of fitness and food that dilutes her niche score. Nakita Johnson (@nakitajohnson39) has 377.3K TikTok followers with only 17% fitness purity. Her content covers family, beauty, and lifestyle alongside fitness. She is a general lifestyle creator who sometimes posts workouts.

Kate Elisabeth (@kateelisabethxo) has 245.3K Instagram followers and 67% fitness purity. She is also founder of @kikakinis, a swimwear brand. That 67% is respectable but not elite—her audience follows her for both fitness and fashion. LifewithLuisa (@lifewithxluisax) has 212.2K Instagram followers and 25% fitness purity. She describes herself as a British Latina foodie. Fitness is a side interest, not her core identity.

The pattern is consistent: the creators with the highest follower counts tend to have the lowest content purity. The creators with the highest purity tend to have smaller but more engaged audiences. This is not a coincidence. Broad appeal drives follower growth. Niche focus drives engagement and conversion.

Why TikTok creators show lower purity on average

TikTok's algorithm rewards variety. Creators who post only fitness content risk plateauing because the platform pushes them to a narrower audience segment. Instagram, especially with its carousel and Reel formats, still allows creators to build a recognisable niche without being penalised.

This means that if you are sourcing creators on TikTok, you should expect lower content purity scores and compensate by looking at engagement rate per fitness-related video. A creator with 20% overall fitness purity might still have individual workout videos that outperform their lifestyle content. The trick is identifying those spikes and building a campaign around them.

For sales teams running outreach at scale, this level of analysis is impossible to do manually. You need a system that pulls platform-level data, scores it against your campaign criteria, and surfaces the top candidates automatically. That is where AI-powered prospect discovery changes the game.

What brands get wrong when they chase follower count

The most common mistake we see is treating influencer outreach like a volume game. A sales rep pulls a list of the top 50 London fitness creators sorted by followers, sends a generic pitch, and hopes for a 5% reply rate. The problem is that the top 50 by followers includes creators like Sophie Macfie (1.63M, 24% purity) and excludes creators like ABBIE DENNISON (554K, 93% purity) who would actually move the needle.

This happens because most CRM and outreach tools do not surface content purity data. You have to cross-reference multiple platforms, manually check feeds, or rely on gut feel. In a fast-moving sales cycle, gut feel usually wins—and gut feel is terrible at predicting ROI.

The result is wasted email sequences, low reply rates, and deals that fall apart when the brand team realises the creator's audience does not match the target demographic. The sales rep blames the creator. The creator blames the brief. The brand blames the agency. Nobody wins.

MiraReach exists to break that cycle. Our platform ingests creator data from sources like Modash, scores prospects by content purity and engagement metrics, and feeds the highest-quality leads directly into your outreach sequences. You stop guessing and start converting.

How to build a creator outreach sequence that actually works

If you are a sales professional targeting fitness brands or creator agencies, here is a three-step framework based on the London data.

Step 1: Define your purity threshold before you search

Decide what minimum content purity your campaign requires. For a fitness equipment launch, set the bar at 60% or higher. For a broad wellness campaign, 30% might be acceptable. Write this threshold into your prospect criteria before you open any tool.

In the London dataset, only ABBIE DENNISON (93%) and Kate Elisabeth (67%) clear the 60% bar. That is two creators out of 95. If your threshold is 30%, you add Sophie Macfie (24%—still below), Emma Petersen (46%), and LifewithLuisa (25%). The pool expands, but the quality drops.

This is a strategic decision, not a data problem. Know your threshold before you start.

Step 2: Score by engagement per niche post, not total engagement

A creator with 1.6 million followers might get 10,000 likes on a fitness post. A creator with 554K followers might get 8,000 likes on the same type of post. The smaller creator has higher engagement density—more of their audience actually cares about fitness.

Calculate engagement per niche post by dividing average likes and comments on fitness content by total followers. Compare that number across candidates. The creator with the highest density is usually the best bet, even if their total follower count is lower.

Step 3: Personalise your outreach with content-specific references

Generic pitches get ignored. When you reach out to a creator, reference a specific post or campaign they ran that aligns with your brand. For ABBIE DENNISON, mention her Gymshark sponsorship and ask how she structures her partnership content. For Kate Elisabeth, reference her swimwear brand and propose a cross-promotion between fitness and fashion.

Personalisation at scale requires data. MiraReach automates this by pulling recent posts, content themes, and brand affiliations into each prospect profile. Your outreach becomes relevant without hours of manual research.

Ready to score creator partnerships that actually convert?

You now know that Sophie Macfie's 1.63M followers come with a 24% fitness content purity warning. You know that ABBIE DENNISON's 554K followers deliver 93% niche alignment. The question is whether your outreach process can tell the difference before you send the first email.

MiraReach helps sales teams automate prospect discovery, score creators by content purity and engagement, and build personalised sequences that land meetings. Stop wasting time on creators who look good in a spreadsheet but deliver nothing in a campaign. See MiraReach plans and start scoring smarter.

Frequently Asked Questions

Who is the top London fitness influencer on Instagram?

Sophie Macfie (@sophsplantkitchen) has the highest follower count at 1.63 million. She is a bestselling author and qualified personal trainer based in London. However, her fitness content purity is only 24%, meaning most of her posts are not fitness-related.

What is content purity and why does it matter for influencer marketing?

Content purity measures the percentage of a creator's posts that fall within a specific niche. For fitness, it tracks how much of their content is about exercise, nutrition, or training. High purity means the audience follows the creator for that niche, which leads to better engagement and conversion for relevant brand campaigns.

Which London fitness creator has the highest content purity?

ABBIE DENNISON (@abbiedennisonfit) has 93% fitness content purity, the highest among the 95 creators listed by Modash. She has 554.1K Instagram followers and is sponsored by Gymshark and ESN. Her next event is Berlin HYROX on 28 May 2026.

How many London fitness influencers are on Instagram versus TikTok?

The Modash list covers 95 creators total: 38 on Instagram and 57 on TikTok. TikTok has more creators listed, but Instagram creators tend to have higher follower counts and content purity scores on average.