This September I swam more in a pool then in the ocean! Having a month-ticket to a nice neighboring pool makes it easier, and there was too much seaweed along the coast this year after the first hot weeks of Fall.
In the pool I used to make around 60 short lengths (25 yards) first, but then my friend pro-swimmer suggested I should do 66 (one mile, or 1650 yards, or 1.5 kilometres), and I switch to a swimmer's mile a day. I turn like I do in open waters, barely touching the walls and it takes me the whole 45 minutes of non-stop breaststroke to finish :) You may laugh about it, but for somebody whose main sport in youth was piano I am doing pretty nicely.
I am looking forward to double the distance if I have a chance to continue in this open air heated pool (~80F) for months, but I am not sure that staying in the chlorinated water for one and a half hours will be very pleasant, in the ocean it is no problem till 2-2.5 hours, but in the Pacific I get cold by the end.
A few days ago I bought a waterproof solar training watch with a timer and 120 laps counting by pressing a button, so now I don't need to keep numbers in my head and can go into a happy trance :)
It is naively assumed that the fact that the majority of people share certain ideas and feelings proves the validity of these ideas and feelings. Nothing could be further from the truth. Consensual validation as such has no bearing on reason or mental health.
Retinoids retinol, retinal, and retinoic acid - 3 active forms of vitamin A - "preformed" vitamin A.
Beta carotene can easily be converted to vitamin A by the human body.
Large amounts of supplemental vitamin A (but not beta carotene) can be harmful to bones.
Vitamin A keeps tissues and skin healthy, plays an important role in bone growth. Diets rich in the carotenoids alpha carotene and lycopene seem to lower lung cancer risk. Carotenoids act as antioxidants. Foods rich in the carotenoids lutein and zeaxanthin may protect against cataracts. Essential for vision lycopene may lower prostate cancer risk.
Recommended daily amount: 700 mcg - 900 mcg or 3 mg - 6 mg beta-carotene (~ 1 cup of raw cantaloupe or sweet red peppers, or 2 mangoes, or 1/5 of one baked sweet potato).
Because the body converts all dietary sources of vitamin A into retinol, 1 mcg of physiologically available retinol is equivalent to the following amounts from dietary sources: 1 mcg of retinol, 12 mcg of beta-carotene, and 24 mcg of alpha-carotene or beta-cryptoxanthin. From dietary supplements, the body converts 2 mcg of beta-carotene to 1 mcg of retinol.