VIRTUX · Analytics

Why analytics change the outcome of your training

Training without data is like driving while looking only at the hood. You can go fast, but you don't know where you are.

Training analytics turns every set you log into a piece of information that accumulates. The more sessions you have, the more useful it becomes. It's the opposite of a notebook: at first it seems like "there's nothing to look at", and at 6 months you have a map of your evolution that you could never reconstruct from memory.

The four metrics that matter (everything else is noise)

There are dozens of metrics an app can show you. Most are overkill. If you could only look at four, make them these:

1. Weekly volume per muscle group

Volume = weight × reps × sets. The unit of measurement for hypertrophy.

  • Effective sets per week per muscle group: 10-20 is the optimal range according to current evidence.
  • Below 10: you're probably under-stimulating.
  • Above 20-25: you're in overtraining or inefficient-volume territory.

VIRTUX shows this on a single chart, broken down by muscle group and week. When a group is under-trained (say, only 6 sets of biceps per week), you know instantly.

2. Frequency (how many times per week)

Frequency is how many times per week you stimulate each muscle.

  • For hypertrophy, twice per week per muscle is the sweet spot for most people.
  • Once works for beginners and for some small groups (calves, forearms).
  • Three or more times only makes sense in short blocks or for very small muscles.

VIRTUX shows frequency per muscle and warns you if you haven't touched a group in 10 days or if you've done 4 sessions of the same group in 5 days.

3. Intensity (RPE or %1RM)

Intensity is how heavy what you're doing is. The most practical way to measure it is RPE (Rate of Perceived Exertion) on a 1-10 scale:

  • RPE 7: you had 3 more reps in the tank.
  • RPE 8: you had 2 more reps in the tank.
  • RPE 9: 1 more rep, max effort.
  • RPE 10: absolute max, nothing left.

VIRTUX calculates the average RPE per session and per muscle group. If it climbs week over week at the same load, it's a sign of accumulated fatigue. If it drops with heavier loads, that's real progress.

4. Progression trend (estimated 1RM per exercise)

The headline metric. The chart of your estimated 1RM over time on your main lifts (squat, bench press, deadlift, etc.).

  • Steady upward line: you're progressing.
  • 3-4 week plateau: time to change something (rep range, exercise, deload).
  • Downward line: fatigue, poor recovery, or a bad program.

VIRTUX calculates estimated 1RM with the Epley or Brzycki formula from any valid set, so you don't have to test your max dangerously to have the metric.

What these analytics look like in VIRTUX

In the "Analytics" section of VIRTUX, all of these metrics are on a single screen, filterable by:

  • Date range (last week, last month, last 3 months, last year, all time).
  • Muscle group (chest, back, legs, arms, core, etc.).
  • Session type (strength, hypertrophy, cardio, technique).
  • Specific exercise.

The visualizations are intentionally simple:

  • Stacked bars for volume per muscle group.
  • Lines for 1RM and RPE trend.
  • Heatmaps for weekly frequency.
  • Week-vs-week comparison tables.

No pretty charts you don't know how to read. Each chart answers one concrete question an athlete asks: am I going up or not? am I fatigued? am I under-stimulating a muscle?

The mistake of looking at "the average"

Bad analytics shows you averages. "Your average weekly volume is 14,000 kg". So what? Is that a lot or a little? Is it more than last month? Is it well distributed across muscle groups?

VIRTUX always breaks it down: by muscle group, by week, by exercise. Global averages are fine as a summary, but decisions are made by looking at the details.

What you should NOT look at (yet)

  • "Exact" calories burned. Rough estimates at best. Useful as an order of magnitude, not as truth.
  • "Sleep quality" inferred by your phone. Not a training metric.
  • VO2max from your watch. Interesting as a general data point, but not for making load decisions.

VIRTUX focuses on what actually impacts your progress at the gym: volume, frequency, intensity, progression. Everything else is noise.

Start looking at your data

  1. Download VIRTUX.
  2. Log 4-6 sessions with weight, reps and RPE.
  3. Open the "Analytics" section and look at the summary screen. You'll see patterns you didn't suspect.
  4. Adjust your plan based on what you see.

The data doesn't lie. And when you've been logging for months, it's the only voice that matters.