Exercise Definition and 578 Threads

Exercise is any bodily activity that enhances or maintains physical fitness and overall health and wellness.It is performed for various reasons, to aid growth and improve strength, preventing aging, developing muscles and the cardiovascular system, honing athletic skills, weight loss or maintenance, improving health and also for enjoyment. Many individuals choose to exercise outdoors where they can congregate in groups, socialize, and enhance well-being.In terms of health benefits, the amount of recommended exercise depends upon the goal, the type of exercise, and the age of the person. Even doing a small amount of exercise is healthier than doing none.

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  1. A

    Solving an Exercise Involving a Cylindrical Tube of Air

    Hi to you all.i have an exercise i cannot solve.i think something is missing. Cylindrical tube V=10L opened at the top has air with a temperature of T1=27 oC.We provide heat to the tube until the temperature reaches the value of T2=327 oC.A)we have to find the amount of air that leaves from...
  2. T

    What are the best exercises for strengthening knees for runners?

    I've looked through Google and can't seem to find a good site on strengthening the knees. I run a lot on the treadmill so any suggestions are appreciated as well. Thank you
  3. A

    Interesting exercise of probability

    A snake with a little more than 4 meters takes a walk for the forest in the following way. After to walk 1 meter in definitive direction it decides aleatoriamente if she capsizes for the left or if she capsizes for the right or if she continues in the same direction, independently of the...
  4. Tsu

    Escape to Nature: A 7-Step Stress Relief Exercise

    1. Picture yourself near a stream. 2. Birds are chirping in the cool, crisp mountain air. 3. Nothing can bother you here. No one knows this secret place. 4. You are in total seclusion from that place called "the world". The soothing sound of a gentle waterfall fills the air with a...
  5. L

    Looking for a QFT Exercise Buddy: A Grad Student's Quest for Mastery

    I'm a grad student. I've done 2 semester of QFT using Peskin but I've didn't too well due to many reasons. I now want to go back and catch up on things I should have learned better, and then learn even more - I want to be a good field theorist. I'd like to see if there's anyone in a similar...
  6. T

    How Do Laser Resonator Length and Deviations Affect He-Ne and VCSEL Lasers?

    We've had a couple of exercises on lasers, and there's two I had some problems with: 1. He-Ne-laser Given A He-Ne laser with a 'base wavelength' (might be a bad translation of terminology, for which I apologize) lambda= 632.8 nm; Level width delta(nu) = 1500 MHz ; Allowed deviation...
  7. C

    Building Muscle: Tips for Runners on Diet and Exercise

    Hey guys, I was wondering what is the best way to build muscle if I run the track. Is it wise to eat a lot of fat, then run my buttocks off for the muscle? Or eat light and low carbs and low calories? What becomes muscles then?
  8. D

    Apostol Calculus Vol.1 Exercise 2 Help Requested

    Hello! Anyone read Apostol's Calculus vol. 1. On p. 28 the exercises feels very hard. Can somebody help me with nr. 2?
  9. H

    How Does Temperature Affect the Electrical Resistance of House Bricks?

    Here is all of the question and the help it gives that i need help with: Help the question gives: When lightning strikes a building the results can be very dramatic. The current in the bricks may cause considerable heating of the bricks followed by rapid expansion and failer of the...
  10. C

    An exercise in eloquence: Basic GTR

    I have two questions that were on a (past due) take home test in my GTR class. There maybe many answers, but I am interested in the best answers. 1) Why is Einstien's GTR a theory of gravity? 2) Why is Einstien's GTR a geometric theory? I welcome anyone who thinks they have an...
  11. B

    Finding Light Shifting Distance: An Exercise in Refraction

    A ray of light strikes a flat block of glass (n=1.5) of thickness 2.0 cm at an angle of 30 degrees with the normal. Find the distance the light is shifted. I found the angle of refraction to be 19.471 degrees. I figured I could find the horizontal distance traveled by rays going through at 30...
  12. enigma

    How Should You Restart Exercise After a Long Break?

    Ow. Just about all I can say. I lifted weights for the first time in the last 9 years today. It's been over 12 hours, and I'm still having problems walking. Particularly up and down stairs. I can't extend my arms all the way. Should have used the lighter dumbells for the curls. On a...
  13. C

    Yoga as Both a Spiritual and Physical Exercise

    Hello all This is my first time posting in the Philosophy Forums. Nice to meet you all! I was wondering whether any of you practice yoga (Hatha, Ashtanga, Iyengar etc..) What are your opinions about its effects on the human mind and body. I myself have benefited a lot from the practice
  14. marcus

    Exploring Alternative Units Systems: A Mind-Broadening Exercise

    It can be useful to construct and try out alternative systems of units---mind-broadening and you can get a different perspective on physics. And in several specialties they do this anyway because it is almost a precondition to being able to think. Whether QFT or Gen Rel they all have their own...
  15. R

    Digital Pedometer for energy expended in exercise

    I use a digital pedometer which has pace counting gigure. Four items are displayed: Pace number , pace number by mile, kilometer as well as consumed calories. I need help in finding out : 1. What is the relationship between distance in kilometers and calories burnt? 2.While the pedometer...
  16. Evo

    Exercise and how do you get motivated?

    I've always kept myself in pretty good shape, I have all of the exercise equipment at home and actually used them every day, until I damaged my knee over a year ago. Now I wiggle and jiggle in places that I shouldn't be wiggling and jiggling. I need to get back into shape but I just...
  17. S

    How to Calculate Velocity After a Spring Releases?

    Velocity from variable force(spring)? What is the velocity of the mass as it breaks contact with the spring? From part 1 I got: A 1.118 kg block is on a horizontal surface with mu-k = 0.150, and is in contact with a lightweight spring with a spring constant of 715 N/m which is compressed...
  18. B

    Difficult nuclear physics exercise

    nuclear physics exercise The activity from a mixed radioactive sample is measured at different times and given in a table like this: Time (h)...Decays/sec ----------------------- 0.0 ...... 7500 0.5 ...... 4190 1.5 ...... 3100 : ...... : : ...... ...
  19. A

    What is the equation for a vector in R^n that satisfies a given condition?

    I was trying to learn something about vectors in greater dimensions then only 3. I got this exercise and I couldn't get to it. Can anyone help me? "Let n and a be vectors in R n , and let P = {× Î R n: n . (x-a) =0}. Find an equation in x1,x2,...xn such that x = (x1,x2,x3...,xn) Î P if and...
  20. B

    Exercise from basic Fourier Analysis

    I really need help with this exercise (it's from a course in basic Fourier analysis). It consists of two parts: (i) Let s_0 = 1/2 and s_n = 1/2 + \sum_{j=1}^{n}\cos(jx) for n \geq 1 . By writing s_n = \left(\sum_{j=-n}^{n}e^{ijx}\right)/2 and summing geometric series show that...
  21. L

    Help A2 physics planning exercise

    Help! A2 physics planning exercise! Is anyone doing the A2 OCR physics planning exercise? I have just finished the AS one that soooooo many people have been talking about (I am resitting it from last year!) but now have the A2 one to do. It is the one with the surface temperature of the...
  22. A

    Solving Exercise: Finding Velocity Vector of Cyclist

    Hi! I have an exercise here that I can't solve. Help please. "One of two cylists cycles in the north-west direction at a speed of 8 m/s making an angle of 53 with the west. The other cyclist cycles in north-east direction at a speed of 6m/s making an angle of 37 with the east. How does the...
  23. J

    (-Planning Exercise - Strain gauge Coursework Help -)

    (--Planning Exercise - Strain gauge Coursework Help!--) Hi I've been stuck for several days in the early stages of my coursework i would have asked my tutor but I have been forced to stay home due to a very bad chest infection :frown: I will first provide a full transcript of the question...
  24. B

    Electric Potential and Forces in Spherical Raindrop Interactions

    i'm having trouble with this: A spherical raindrop has a charge Q = 3*10^-11. The potential at the surface is V = 500 V (V = 0 infinitely far away). a) Determine the radius of the drop. My first thought was to consider the raindrop as a point charge and then integrate the electric...
  25. Adrian Baker

    Medical Students training exercise

    Medical Students training exercise... First-year students at Med School were receiving their first anatomy class with a real dead human body. They all gathered around the surgery table with the body covered with a white sheet. The professor started the class by telling them, "In...
  26. P

    The Science of Exercise: Understanding People's Motivations and Habits

    I am interested in finding out how often most of us here on PF exercise per week. By exercise I mean deliberate physical activity undertaken to maintain and/or improve fitness. I currently exercise 5 days a week.
  27. L

    Exercise Benefits Mind: Beyond Mood

    Are there any benefits for the mind from exercise, as well as body, apart from on mood?
  28. M

    An Exercise in nothing semantics.

    An Exercise in "nothing" semantics. I apologize for not being able to include the responses, in fact my computer is moving so slowly that I'm not going to be able to copy the exact original post. The point was this: If you take a sentence, where the word "nothing" is used, and replace...
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