...or if you want to be nice: strongly dislike. Because this is a fitness blog, I will only go into things involving fitness.
1. High heels. Well, there are obvious reasons why I don't like these on guys... but why don't I like it when girls wear them? And how does this pertain to fitness? Let me explain.
I like to have the body functioning properly and hopefully with considerable strength and speed. High heels do not encourage proper body function. They cause constant plantar flexion of the ankle, which causes tight calves (already too common), tight calves can cause shin splints, pulled achilles tendon, and/or knee pain. Yay, already not good. That's not all folks! Heels also move your center of gravity forward a little, shrink your base of support plus your tightened calves will tighten your hamstrings (and make them inactive)... Increasing your risk for hamstring injury. Now, overtime that can cause your hips to anterior tilt and your femurs to internally rotate. Internally rotated femurs can the knees to cave in (and maybe the ankles next). This can lead to an ACL or MCL injury. No one wants that. Anterior pelvic tilt causes the lower back to arch. Arched lower back+time=back pain. Back pain is usually a sign that you are at risk for injury. Back injuries are one the worst injuries possible. Don't let this happen to you.
Sometimes an arched lower back can lead to a rounded upper back. Why? Because if the thoracic spine (upper spine) was straight or arched (following the lower back) you would be looking at the ceiling all the time. A rounded thoracic spine can cause upper back pain, shoulder pain, neck pain and stress head aches. Yeah, I bet you didn't know high heels could be so bad!
2. Lazy posture. Most commonly seen as a rounded upper back in some way. Usually head is forward, shoulders rounded, upper back rounded, lower back either rounded or arched. Yeah. Pretty much can cause more damage than high heels... I don't feel like explaining it all... and you probably don't want to read a wicked long post either.
3. Pushing-but-not-pulling. Mainly horizontal pushing and horizontal pulling. This pertains to posture as well! Noticing a theme? If you're horizontally pushing (bench press, push up, dip, etc), you're strengthening the pec, pec minor, anterior deltoid, the latissimus dorsi and a few other muscles. All of which encourage internal rotation and/or protraction of the shoulders. Which pretty much means slouching/rounded up back and shoulders. This can be taken care of simply by working on external rotation and rows!
Why does this happen so often? Because of lack of knowledge, laziness or wanting "big pecs". Rows are your best friends when it comes to posture and a healthy upper body!
4. Curl monkey-ing (or just over isolation). This is hard to do with bodyweight only exercises, but it can still happen. Curl monkeys are guys (or girls) who do lots and lots of bicep curls so that they get that nice "bicep peak" or "pumped up" look. Sorry dudes, that's a pretty poor way to get bigger arms (and stronger). Compound (multi-joint) movements are where it is at. They build more strength (more muscles used in unison), which means more weight (or stress) which means more strength gains! It is also how the body was meant to move! This can actually go for more than just bicep curls. Triceps extensions, pec flies, quad extensions, hamstring curl, calf raiser, wrist curls, etc... all of which are not needed in the slightest for a new lifter. Don't waste time on isolation! If you have a solid 2-4 years under your belt, then you could work on some more isolation.
I almost forgot: the one thing that could use isolation is the rotator cuff, it can be hard to work on some muscles in there when you're not isolating the muscle.
5. "Toning".
We all heard it: "So, what are your goals?" "I want to tone my abs and my arms."
"Why are you using that light weight?" "It helps me tone my arms"
"You should be using a heavier weight." "But I don't want to become big and bulkly, I just want to get toned."
The list goes on...
Fun fact: you can't "tone" a muscle. Toning is a made up word that sounds nice. It means nothing in the fitness world. If you say you want to "get toned", I will assume you want to get your muscle "harder", while burning fat. Sadly, when someone is "toning", they use very light weight for very high reps. If you remember from my post about strength, that's not how build muscle. You may burn a few calories, but no where near as many if you used a weight you could only lift 6-12 times.
Sometimes I wonder if the term toning was thought up so that you would not need to do hard work, while thinking you're doing hard work. Here is how to get a "toned" body: lift heavy, eat healthy and do some HIT. None of that lift-a-5-pound-dumbbell-for-75-reps stuff. 5 pound dumbbells are for rotator cuff work and injury rehab, not "toning".
6. Bad lifting mechanics. This can be related to posture, but people with good posture can fall victim to this all the time. Too many times I see rounded backs, caved in knees and heels off the ground.
A rounded back when lifting something up can pull muscles, slip discs and pinch nerves. If the object you're lifting is too awkward to carry with a straight back, fill your lung and brace your abs and back very hard. Pushing your abs out, do not suck them in. Pushing them out is a much safer and stronger postion. This will transfer some of the weight off the spine and into your muscles.
Caved in knees can be do to posture problems, but when lifting something off the ground think about ripping the world in half with your feet. Or some would say: "spread the floor." But ripping the world in half sounds cooler. This helps align the knees so that they are in a healthier postion when lifting something off the ground.
Heels off the ground. Not as bad as the previous two, but still very common and bad. Usually, when you pick something up ans your heels come off the ground, your knee passes way over the toes. This puts a ton. If sheer force on the patella tendon. This can cause knee pain if done too often. The one time this is acceptable is when doing so allows you to keep your back straight. Keep your heels on the ground when lifting something off the ground!
7. "I can't ____ because it hurts my ____". If you're injured or have a real medical issue, this can slide, but if you can't do something like squat or row because it hurts, figure out what is wrong and take care of it! Most likely you have bad form. Have someone who knows their stuff assess your form. Sometimes you get pain because you have imbalances. If you do, take care of these imbalances.
There you have it: 7 things that really bug my guts out.