The loading method
Progress the tissue, then progress the sport
The method at Urbanfitnesssingapore is a written sequence. We raise the force a tendon or calf can hold, then the speed at which it can store and return energy, then the weekly volume of running or court work. Each step has a number attached so the next session is not a guess.
Why we start slow
A tendon that has been irritated, or a calf that has not seen structured load for months, does not fail first at high speed. It fails when force arrives faster than the tissue can organise. That is why the first weeks are often isometric holds: a joint angle is set, a load is added, and nothing moves for 30 to 45 seconds. The hold is boring on purpose. It lets us raise force without a stretch-shortening cycle.
Heavy slow resistance, which we write as HSR on the sheet, is the next layer. A calf raise or a knee-dominant lift is taken through range with an eccentric tempo — the lowering portion — of three to six seconds. The concentric is controlled, not bounced. We use HSR because time under tension is a clearer dose than “three sets of fifteen done quickly”. If the next morning is quiet, the load on the bar or the time under tension goes up at the fortnight review.
RPE sits beside the numbers. Rate of perceived exertion, on a 0–10 scale, tells us whether the prescribed load actually felt like the intended effort. A set written at RPE 7 that is reported as a 9 is treated as a heavier session than the sheet intended. We change the next session; we do not argue with the score.
From slow force to stored energy
When isometric holds and HSR are stable, the tendon has to learn to behave like a spring again. That is energy-storage loading, and it is counted, not waved through.
The acute-to-chronic load ratio
The acute-to-chronic load ratio compares this week’s training load with the average of the previous four weeks. We use minutes, kilometres, or court contacts — one currency per person — so the ratio is not a mash of unlike numbers. A jump from a quiet month into a long weekend of matches will read as a spike even if each session felt fine on the day.
We treat the ratio as a conversation starter, not as a green light. A figure around 1.0 to 1.3 is usually where we like to sit when someone is still rebuilding. Above that, we ask whether the extra volume is sport that matters or leftover habit. The ratio never overrules a bad 24-hour response. If the heel is worse and the ratio looks tidy, the heel wins.
People sometimes arrive with a spreadsheet already. We will use it if the units are consistent. We will not invent a second tracker that fights the first. The studio sheet only needs the weekly total, the four-week average, and a note on sleep and heat, because both change how the same kilometre feels in Kallang.
An illustrated eight-week spine
The weeks below show how the layers usually sit. They are a teaching sketch. Your sheet will name different lifts and a different outdoor plan.
- Weeks 1–2 — isometric holds Mid-range calf or knee holds, 4 to 5 sets of 30–45 seconds, RPE 6–7. Outdoor work stays at the volume you can already do without a next-day flare. No new plyometric dosage.
- Weeks 3–5 — heavy slow resistance HSR calf raises or a knee-dominant lift, 3 to 4 sets of 6–8, eccentric tempo of four to six seconds. A short walk-run or a closed-court hitting block may start if the 24-hour rule is quiet.
- Weeks 6–7 — energy-storage Low pogo or skip contacts added two times a week. Strength work stays, but we do not raise the bar in the same week we first add hops. Court or run volume moves only if the hop battery at the fortnight is stable.
- Week 8 — retest and a planned deload Repeat the single-leg heel-raise endurance test and the hop battery. If exit criteria for this phase are met, week 8 is a deload week: volume down, quality kept, then a new block is written. If they are not met, we hold the current dose rather than invent a harder week.
Illustrative example of a typical block. Not a client record.
Heat, sweat rate and evening sessions
Kallang in 2026 is still a hot place to rebuild running. We ask for a simple sweat-rate check once outdoor work returns: body mass to the nearest 0.1 kg before and after a known easy session, with fluid intake noted. The figure is a planning number for how much to drink in the next similar hour. It is not a medical investigation of hydration status.
Heat acclimatisation — the process of doing repeated work in the climate you will race or play in — is paced. The first outdoor bouts after a break are placed in the cooler window of the day. We do not stack a new plyometric dosage, a longer run and a noon start in the same week. If you only have lunch hours, we shorten the bout rather than pretend the heat is irrelevant.
What the method refuses
We will not skip the slow work because a race is in four weeks. We will not add a jump circuit because it looks athletic on the floor. We will not diagnose why the tendon is sore, and we will not adjust a clinician’s restrictions. Urbanfitnesssingapore provides exercise coaching, not medical care. We do not diagnose injuries and we do not replace your doctor or physiotherapist. If you have pain, see a clinician first; we are happy to work alongside them.
The method is also narrow on purpose. There is no bodybuilding split, no powerlifting meet peak, and no group class that borrows the language of load progression. If you want those, another studio will serve you better. If you want a sheet that names the next fortnight in repetitions, tempo and kilometres, book the audit.