Bodyweight Fitness: BWF Daily Discussion and Beginner/RR Questions Thread for 2020-09-09 |
- BWF Daily Discussion and Beginner/RR Questions Thread for 2020-09-09
- For those using resistance bands--a physics-related note on force curves, and why you should stretch a lighter band further, vs. using a heavier band
- My approach to the ‘Homemade Pull-up Bar’ question
- How to tell who actually knows what they are talking about??
- What should I invest Rings or bends?
- I don't know what to do anymore with that stupid muscles up
- Any potential long term risks for finger tips pushups?
- OAC - Great at assisted OAC and negatives but can't even pull myself up an inch. Tips?
- Ikea hack for dips bars.
- Does balance on unstable surfaces transfer to stable surfaces?
| BWF Daily Discussion and Beginner/RR Questions Thread for 2020-09-09 Posted: 08 Sep 2020 11:05 PM PDT Welcome to the /r/bodyweightfitness daily discussion thread!
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| Posted: 09 Sep 2020 05:12 AM PDT As has been discussed many times before, resistance bands do not have a constant force experienced--the more you stretch it, the more force there is. However, I just wanted to add something about the choice between using a lighter (less force experienced) resistance band and stretching it out further, or using a heavier resistance band and not stretching it out as far. What I mean is: let's say you are hooking your resistance band to the bottom of a door, walking a certain distance away from the door with the band until it is taut, and then performing a curl. What is the difference between walking 1 foot away from the door with a heavy resistance band, versus walking 2 feet away with a lighter resistance band? TL;DR: you will experience a more constant force if you use the lighter resistance band and walk further away. We can determine this using Hooke's Law, which states:
Where F is the spring force, k is the spring constant, and x is the distance the spring is stretched. So let's consider two examples: A light resistance band with a spring constant of 0.5 N/m, and a heavy resistance band with a spring constant of 1 N/m. Let's say for the light resistance band, we're going to start with it stretched out by 2 feet. Then, for the force to be the same with the heavy resistance band, we must start with it stretched out by 1 foot (since the spring constant is twice that of the light band). Ultimately, the force experienced in both scenarios is the same--0.3048 Newtons. Now, let's say we will stretch the bands an equal amount when we perform the curl and pause at the top. Let's say that the distance by which x, the displacement increases, will be 0.5 feet. Our spring constants stay the same, so for the light band we will now have x=2.5 ft, and for the heavy band we will have x=1.5 ft. For the light band, the force experienced is now 0.381 Newtons. For the heavy band, it's 0.4572 Newtons. So the two force curves would look like this: Obviously there are limits to how much you can stretch a band based on the material's elasticity, in which case you will need to move up to the next heaviest band you have, but try to max out your lighter band first so you can bang out more reps without exhausting yourself too early because of the heavier force at the peak of the lift (unless that's the portion of the lift you're trying to target with your training). Thanks for coming to my ted talk Edit: Based on the discussion below, just wanted to add a safety warning--this doesn't mean you should be stretching your bands to the absolute limit! This advice is meant more for the early stages of the band being stretched--when in doubt about whether you're stretching a band too far, be on the safe side and move up to a heavier band. The difference in the force curves is peanuts. Also, it is a great idea to wear a pair of lightweight safety glasses while using resistance bands. Another suggestion is to invest in a base where you can clip the bands on to stable hooks, versus standing on it--if the band slips out from under your foot it can really do some damage snapping back at you. [link] [comments] |
| My approach to the ‘Homemade Pull-up Bar’ question Posted: 08 Sep 2020 03:04 PM PDT https://imgur.com/gallery/iz99MmG (42M) 6'6" and 240 lbs. Needed something taller, wider, thicker, and more stable. Didn't like what was in the gym (too short or too skinny). Other homemade approaches just looked unstable. Needed to be able to move it (military) so no cement posts and beams. $200 of 1" steel pipe from Home Depot, couple connectors, and two adjustable hammock straps later, I am in heaven! [link] [comments] |
| How to tell who actually knows what they are talking about?? Posted: 09 Sep 2020 08:46 AM PDT As many of you know there are tons of fitness people on social media and YouTube, but how do we tell who actually knows what they are talking about?? Seems to me they many just read and listen to each other and recycle the same information. How do we, as beginners, know that we can trust "This Person's" or "That Person's" advice, counsel, or routines? If I was 18 I wouldn't worry as much about hurting myself but those days are long gone and the last thing I want from "getting in shape" is an injury. [link] [comments] |
| What should I invest Rings or bends? Posted: 09 Sep 2020 11:35 AM PDT I'm praticing bodyweight exercices for a month and my main goal is to achieve the max amout of hypertrophy. I'm noticing that I'm lacking gains in very specific muscles and I'm considering to buy a equipment that allow me to target these muscles. I would like you guys to consider this:
So with that said, what do guys recommend me to cover these issues? Bends that I'm thinking to buy: [link] [comments] |
| I don't know what to do anymore with that stupid muscles up Posted: 09 Sep 2020 08:31 AM PDT Yo, I'm training for some time and i must say i'm doing fine with body weight ex. like, doing 25+ pull ups, front lever, 7 pull ups with 45LBS... getting really close to one arm pull up. But for some stupid reason, i just can't muscle up, i feel like people way weaker then me can do. I'm not saying that i'm super strong or something, but i'm not weak, nor not strong enough to do muscle ups... So, i would like to get some tips from you people, thanks! [link] [comments] |
| Any potential long term risks for finger tips pushups? Posted: 09 Sep 2020 08:19 AM PDT Hi, I'm a 15 year old male and I'd like to start practicing fingertips pushups since I'd like stronger fingers for playing guitar. Of course I know about all the risk of injury and I'll be sure to take it easy by doing the right progressions, resting enough and slowly building myself up, but are there any long term risks to this? For example does it increase the risk of developing arthritis in the future? Thank you. [link] [comments] |
| OAC - Great at assisted OAC and negatives but can't even pull myself up an inch. Tips? Posted: 08 Sep 2020 05:17 PM PDT I've been training OAC for a few months now. I can hold the top position for 12 seconds and do a 15 second controlled negative (all the way from top to bottom). I also do a lot of assisted OACs and feel pretty comfortable with the movement. However, when I actually try to do an OAC I literally can't even pull myself up an inch! I've read from some people that a 10-15 second negative is usually enough to do an OAC. But I don't feel like I'm anywhere close yet. Anyone have any advanced tips for OAC for someone who already has pretty strong negatives? [link] [comments] |
| Posted: 08 Sep 2020 06:04 PM PDT I was getting rid of some tables when the legs on my tables caught my eye - they were Ikea's ODDVALD legs. They seemed like they can be makeshift dips bars. And they work! Just wanted to let you know that for 15 dollars each or 30 for a set, they work as semi-decent bars. They don't adjust or anything but, it's just a tid bit I wanted to share. For reference, I'm 5'9" and they give me a full range of motion. Obligatory warning though, it might break on you and cause serious injury, so try at your own risk! [link] [comments] |
| Does balance on unstable surfaces transfer to stable surfaces? Posted: 08 Sep 2020 08:39 PM PDT Anyone have any experience with this and care to elaborate? Never really gave it any thought, once in a while I play around with squats and handstands (not quite as long for the latter) on bosu balls to entertain myself but that's about it. Part of me feels like it could be beneficial but the other part thinks they're entirely separate things. [link] [comments] |
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