What the plans are built on, and where it comes from

Weekly volume matters, and then it matters less^{Source 1,2}

Volume means the number of hard sets you do per muscle per week. It is the single strongest dial you have. More sets produce more muscle growth on average, and the relationship holds across a wide range of weekly set counts.

The important part is the shape of the curve. The gain from your fifth weekly set is much larger than the gain from your twentieth, and the fatigue cost does not shrink to match. A meta-regression pooling 67 studies and 2,058 participants found growth continuing to rise with weekly volume while the return on each additional set diminished.

What Amble does with that: start low, add sets only when the current ones are being handled well, and stop adding long before your week becomes unmanageable. A beginner does not need a high-volume programme, and giving them one mostly buys soreness.

Intensity matters less than beginners assume^{Source 1}

Intensity, meaning how heavy the weight is relative to your maximum, is what most people picture when they imagine training. It is real, and it is also the thing most likely to hurt a returning trainee in the first month.

Established guidance places novice training in moderate loading ranges with progression over time rather than maximal effort from the outset. Leaving two or three repetitions in reserve on each set gives you most of the stimulus at a fraction of the risk and the recovery cost.

What Amble does with that: every early set is prescribed with reps in reserve, and the load only rises when you hit the top of the target range with clean technique.

Two to three sessions a week is enough to start^{Source 1,2}

Training frequency, meaning how many times a week you train, is where most plans overreach. Standard guidance for people beginning resistance training sits at two to three sessions per week for the whole body, which is enough to drive adaptation while leaving room to recover.

Frequency also interacts with volume rather than replacing it. Spreading your weekly sets across more days can make each session easier to complete, but the weekly total is what the adaptation responds to.

What Amble does with that: a first block of two or three full-body sessions, walking in between, and no pressure to add a fourth day.

Consistency beats optimisation in the first year^{Source 1}

This is where we have to be careful about what is evidence and what is judgement. What published guidance supports is that adaptation depends on training being performed repeatedly over time with gradual progression: it is the accumulation that produces the result, not any individual session.

What follows from that is arithmetic rather than physiology. A programme that is 20% better on paper produces nothing if it is abandoned in week six, and a programme you complete two thirds of the time for a year produces roughly a hundred sessions. That comparison is ours, not a research finding, and we would rather label it than dress it up.

What Amble does with that: optimise for the plan still being followed in month twelve, and treat the perfect programme as the enemy of the completed one.

A plan that survives a bad week beats a better plan you abandon

This is a design principle, not a scientific claim, and it is the reason the product exists in the shape it does. Every training plan meets a week it was not written for. The question is what happens next.

If the plan has no mechanism for absorbing a missed session, an overeaten Monday or a sore knee, the user has to invent one. Most people invent the same one: stop, feel bad, restart in January. Amble takes on that job instead, which is why the coach conversation and the propose-then-confirm loop are the centre of the product rather than a feature on the side.

Where food and supplement numbers come from^{Source 3,4,5,6}

Calorie and protein figures are only as good as the food composition data behind them, and that data is country-specific. Amble uses Livsmedelsverket, the Swedish Food Agency, for foods bought in Sweden and USDA FoodData Central elsewhere.

The clearest example is minced beef. Swedish and American products are commonly sold at different fat percentages under similar names, so the same weight of the same nominal ingredient can carry a materially different calorie figure depending on which country's database you look it up in. Using the wrong one quietly corrupts every daily total.

For supplements, doses are presented against the EU nutrient reference values that EU labels are measured against, and product contents are checked against the NIH Dietary Supplement Label Database, which records what labels actually declare.