Heater
A free tennis training library

Train the game inside the game.

An open reference of what actually makes players better — stroke cues, point patterns, and the mental game. Read it all freely, no account needed. When you want it tailored to your matches, that's what a profile is for.

STROKE CUES·POINT PATTERNS·MENTAL GAME·MATCH DAY
EXAMPLE · WHAT A PROFILE SHOWS YOU
74
HEATER
+6 this month
A single score for
your decision-making.
YOUR COACH'S READ
Your backhand under-rotates when you're on the run. This week we'll drill an earlier take-back — small change, big margin.
CONSISTENCY
81%
DECISION
68%
COMPOSURE
70%
The library

Five ways in

Five focused libraries — technique, tactics, the mental game, the rating systems, and a full tennis dictionary. Start wherever your game needs it most.

Your tools

Make it yours

Library · Technique

Strokes & the serve

Every fundamental shot broken down — how to hit it and what breaks down under pressure — plus the one shot you control completely.

Technique

Every stroke, broken down

The fundamental shots — what they are, how to hit them, and the mistakes that break them down under pressure.

Library · Tactics

Win the point, not just the rally

The cues, patterns, and rally-building habits that decide points — stay in, build pressure, and take the clear chance.

Free · Tennis IQ

Universal cues that win points

One simple thought per situation. Under pressure, layered instructions fall apart — these are physical anchors that trigger the right move without overthinking.

Patterns

Play smarter, not just harder

Positioning, pattern recognition, and shot selection win matches. 70% of points at club level end in unforced errors — build pressure safely and take the clear chance.

Decision ladder

Match your shot to your comfort

Before you pick a shot, read your position. The more stretched and rushed you are, the more margin you play; the more set and forward you are, the more you attack. Defend the low numbers, finish the high ones.

Tennis court heat map showing where you are on court and what it lets you do: deep defensive and reactive zones near the baseline, neutral and transition zones in mid-court, aggressive approach and net-finishing zones near the net.
The same idea on the court itself: the further back and wider you are pulled, the more you defend and reset (the hot red and orange zones); the more forward and set you are, the more you attack and finish (the cooler yellow and green zones near the net). The ladder above is how you decide; this is where those decisions live.
Rally building

Stay in. Wait. Strike.

Rally building by player type
Library · Mental & match day

The game inside the game

Most inconsistency is process, not technique. Here’s the mindset, the warm-up, and the between-point reset that keep you steady.

Mental game

The game inside the game

Most inconsistency isn't technique — it's a breakdown in process, routine, or focus under pressure. These are the tools to stay steady when it matters.

Warm-up

Arrive ready, not rusty

Between-point reset

The 20-second window

Universal reset sequence
Scenario playbook
Library · Fitness & body

Train, fuel & stay on court

Hydration, fuelling, conditioning, and how to prevent injuries and cramping — so your body holds up as well as your game.

General guidance, not medical advice

This is educational information to help you play and recover better — it isn't a substitute for a doctor, physio, or registered dietitian. If you have pain, an injury, a health condition, or symptoms that are severe, recurring, or not improving (including frequent cramping), get assessed by a medical professional.

Library · Reference

Look it up

The rating systems explained and principles from the best coaching minds in the game.

Ratings

NTRP, UTR & what they actually mean

NO OFFICIAL CONVERSION EXISTS

NTRP and UTR measure different things. Treat the UTR ranges below as community approximations, not guarantees.

Coaches corner

Wisdom from the best minds in tennis

Principles and publicly shared insights associated with the world's top coaches — paraphrased into practical takeaways, with sources to dig deeper.

Specifically for recreational players
Library · Dictionary

The tennis dictionary

Search and browse the terminology — court geometry, scoring, shots, spin, serve, rules, tactics, movement, and the mental game. Tap any term to expand it.

Player Profiler

What kind of player are you?

Five quick questions. You'll get your type, your strengths and weaknesses, and how you match up — then take it to the AI coach.

Not sure of your NTRP level?

Take the rating survey — 26 questions, an estimated level, and what to work on next.

Matchup Lab

Head-to-head: how the styles stack up

Pick two player types and see who's favored, plus the game plan for each side.

VS
All player types

The six archetypes at a glance

NTRP rating survey

What's your level?

26 quick questions across 8 areas of your game. You'll get an estimated NTRP level, a breakdown by skill, and what to work on next — instead of guessing a number.

Already have a UTR?

Your Universal Tennis Rating is built from real match results, so if you have one we'll use it as your level — it takes priority over the survey below. No UTR? Just take the survey.

Rating type
0 / 26 answered
Strategy Lab

Build a game plan

Tell us your game and the matchup, and get three distinct plans — each with shot patterns you can save, diagram, take to a match, and rate afterward.

How you want to play it
Handedness

Plans are AI-assisted ideas, not guaranteed advice — trust what's actually working in your matches, and see a coach for technique or a medical professional for any physical issue.

Train · Track a match

Log it on the changeover

A 20-second check-in every changeover beats trying to remember it all afterward — and the recall itself is good training. It saves to your journal and builds your trends.

Train · Drills

Practice with a purpose

Drills that train decisions, patterns, percentages and pressure — the game inside the game, not your swing. Pick a focus, grab a partner or a basket, and score yourself.

Heater CoachAsk me about your game, technique, or strategy
Coaching style

Heater's coach gives general ideas and can be wrong — it's not a substitute for a qualified coach, physio, or doctor. For pain, injury, or recurring issues like cramping or dizziness, see a medical professional.

TODAY
Welcome back.
Your one focus right now

Log a few sessions to set your focus

As you log matches, your coach surfaces the one thing worth working on — and tracks whether it holds up under pressure.

HEATER

Match journal

Every session you log sharpens your profile and your coach's read.