Bicep Curl
- Muscles
- Biceps · Forearms · Brachialis
- Variations
- Standard · Incline · Hammer · Preacher
- Form tips
- Keep elbows close to sides. Avoid swinging or momentum. Control the descent. Squeeze at the top.
About CalmArmsYour phone can
Your phone can
keep score.
Most people log their lifts by hand, or not at all — and never really know how each rep looked. CalmArms watches your set: it counts every rep, grades each one, and tracks your progress. You just lift and drop in the weight.
The problem
Tracking your lifts is a chore.
Logging every set by hand is tedious, so it slips — and even when you do log it, there's no record of how the reps actually looked. Progress gets fuzzy, form problems go unseen, and training time gets wasted.
Our solution
Point your phone. It keeps score.
Point your phone, start a set. CalmArms reads your body in real time — counting every rep and grading each one against ideal templates — then you add the weight and the set's logged, with your progress tracked over time.
Under the hood
How the AI actually works.
On-device pose detection
Apple's CoreML stack reads 33 body landmarks straight from your camera feed. Every frame stays on your device — your video is never uploaded.
Angle comparison against ideal templates
Each exercise has expert-recorded keyframe templates. Your joint angles are continuously compared in real time and scored on similarity.
Exercise-specific scoring
Bicep curls weigh elbow angle. RDLs grade hip hinge and spinal neutrality. Lateral raises grade shoulder abduction. The grade reflects what actually matters for that lift.
Form-issue detection
Elbow flare on pulls, back rounding on hinges, hip-flexor takeover on crunches, momentum-driven cheating, incomplete range of motion — the system names the issue and tells you what to fix on the next rep.
Exercise library
18 exercises, dialed in.
59 variations covering arms, shoulders, chest, back, legs, and core — each with tailored scoring weights and form-issue detection.
Tricep Extension
- Muscles
- Triceps (long, lateral, medial heads)
- Variations
- Cable Pushdown · Overhead · Kickback
- Form tips
- Pin elbows to sides. Only forearms move. Full extension without hyperextending. Stand upright.
Shoulder Press
- Muscles
- Anterior + Lateral Deltoids · Triceps · Upper Chest
- Variations
- Dumbbell · Barbell · Machine
- Form tips
- Sit upright, feet flat. Start at shoulder height with 90° elbows. Press straight up, not forward.
Lateral Raise
- Muscles
- Lateral Deltoids · Upper Trapezius
- Variations
- Standing · Seated · Cable
- Form tips
- Slight bend in elbows. Lead with elbows. Raise to shoulder height only. Controlled descent.
Bench Press
- Muscles
- Chest · Front Deltoids · Triceps
- Variations
- BB Flat · DB Flat · BB Incline · DB Incline
- Form tips
- Film from the side. Lower the bar to your chest under control, press to full lockout, and keep a steady, natural bar path.
Pec Deck
- Muscles
- Chest · Anterior Deltoids
- Variations
- Standard
- Form tips
- Sit with back flat against pad. Elbows on the pads, not hands. Squeeze inward — don’t collapse arms.
Fly
- Muscles
- Chest · Anterior Deltoids
- Variations
- DB Flat · DB Incline · Cable Low · Cable Mid · Cable High
- Form tips
- Slight bend in elbows, locked. Wide arc — don’t turn it into a press. Stretch at the bottom, squeeze at the top.
Lat Pulldown
- Muscles
- Lats · Rhomboids · Rear Deltoids · Biceps
- Variations
- Wide-Grip · Close-Grip · Reverse-Grip · Single-Arm
- Form tips
- Drive elbows down toward hips, not back. Slight torso lean only. Pull to upper chest, not the chin.
Pull-Up
- Muscles
- Lats · Biceps · Forearms · Mid-Back
- Variations
- Pronated · Chin-Up · Neutral-Grip
- Form tips
- Start from a dead hang. Drive elbows down. Chin clears the bar. No kipping — control the descent.
Row
- Muscles
- Lats · Rhomboids · Mid-Back · Rear Deltoids
- Variations
- Wide-Grip Cable · Close-Grip Cable · Single-Arm Cable · BB Bent-Over · DB Bent-Over · Single-Arm DB · T-Bar
- Form tips
- Hinge at the hips, flat back. Pull to the lower chest / upper abs. Elbows tracking back, not flared out.
Leg Extension
- Muscles
- Quadriceps (all four heads)
- Variations
- Standard · Single-Leg
- Form tips
- Back flat against pad. Full extension at the top — squeeze. Controlled descent — don’t let the weight slam.
Seated Leg Curl
- Muscles
- Hamstrings · Calves (assist)
- Variations
- Standard · Single-Leg
- Form tips
- Pin hips to the seat. Curl heels under the seat with control. Resist the eccentric — that’s where growth happens.
Calf Raise
- Muscles
- Gastrocnemius · Soleus
- Variations
- Standing · Single-Leg · Seated
- Form tips
- Full stretch at the bottom, full peak at the top. Pause at peak. Slow eccentric.
Squat
- Muscles
- Quads · Glutes · Hamstrings · Core
- Variations
- Bodyweight · Goblet · BB Back · BB Front
- Form tips
- Break at the hips and knees together. Hit at least parallel depth. Keep your torso angle and drive through mid-foot. Back-rounding is the key safety check.
Deadlift
- Muscles
- Hamstrings · Glutes · Erectors · Lats
- Variations
- Barbell RDL · Dumbbell RDL · Single-Leg RDL · Stiff-Leg · Conventional · Sumo · Trap-Bar
- Form tips
- Neutral spine throughout, bar close to the legs. RDLs are a hip-hinge; conventional, sumo, and trap-bar floor pulls bend the knees to reach the bar and lock out.
Crunch
- Muscles
- Rectus Abdominis
- Variations
- Standard
- Form tips
- Curl the shoulders toward the hips — small range. Lower back stays planted. Drive with abs, not neck.
Sit-Up
- Muscles
- Rectus Abdominis · Hip Flexors
- Variations
- Standard · Decline
- Form tips
- Anchor your feet. Roll the spine up vertebra by vertebra. Eccentric is where the work hides.
Hanging Leg Raise
- Muscles
- Lower Abs · Hip Flexors · Grip
- Variations
- Standard
- Form tips
- No swinging — kill momentum at the bottom. Drive knees / legs up by curling the pelvis. Slow descent.
The scoring axes
Five components. One grade per rep.
Each rep is scored 0–100 across five components. The weights shift slightly per exercise to match what actually matters for that movement.
35%
Angle accuracy
How well your joint angles match ideal positions throughout the rep
25%
Range of motion
Full extension and contraction for complete muscle engagement
15%
Stability
Keeping your body steady with no swinging or compensating
15%
Tempo
Controlled, consistent rep speed without relying on momentum
10%
Bilateral balance
Even effort between left and right sides on two-arm exercises