Rich, the useful way to think about your sheet is that there are two clocks running, and they end at different times.
The first is mechanical, and it's the one your "14 days" line is protecting. Heavy effort raises blood pressure, and holding your breath under load, the Valsalva manoeuvre, every heavy lift you've ever grunted through, spikes it further. In the first week or so that pressure can cause pinpoint bleeding around grafts that are still anchoring, so the early restriction is about effort and straining, not perspiration. The ramp that follows from that is roughly what LiamOD describes: walking from day 1, cardio you can hold a conversation through from about day 10 to 14, resistance work from weeks 2 to 3 with continuous breathing and nothing near maximal, then contact sports, pools and saunas at about the month mark. Pools wait longest not because of sweat's cousin chlorine alone but because prolonged soaking macerates healing skin.
The second clock is biological and runs from about week 2 to week 6, and it's why sweat gets its reputation. Sweat leaves the gland close to sterile; the real issues are the salt crust that itches (fingers being the actual hazard, as Liam's nurse said), scabs kept permanently soggy, and folliculitis, small pimple-like spots where new hairs push through blocked follicles. A modest crop of these is common in weeks 2 to 6 and settles; sweat-soaked fabric clamped on the scalp is the classic aggravator, which neatly answers your hat question too. The rule is contact and pressure, not hats as a category: something loose, clean and breathable that sits off the grafts is commonly cleared from about day 7 to 10, fitted caps and helmets nearer two weeks plus, and wash whatever you wear, because a ripe gym cap on healing skin is the folliculitis recipe. True infection, for calibration, runs under 1%. The wider arc, including where these weeks sit in the whole recovery, is in what hair transplant recovery involves.
Ring your clinic as planned, because case size and where your grafts sit change the numbers, and ask them to translate the sheet into your actual week: "when can I do X" gets better answers than "is this normal". They write those sheets for the cautious average; they'll happily tune one for a man with a wedding on the 30th. Spreading redness, pain, or discharge is the version of any of this that skips the forum and goes straight to them.