Other things to consider with resistance-based workouts:
- Enhance the intensity (and difficulty) by FOCUSING on the muscles being worked in both directions. Slow down so that you are CONTROLLING the movement with the muscle versus cheating the movement with momentum.
- Keep in mind the concepts of fatigue and failure. By the end of the reps, you should be seriously at the point of thinking/knowing "I could not do one more (with good form) if I had, too", i.e. fatigue. Failure is the point where you literally can not do one more. Many consider the point where it gets difficult to be "fatigue", but that's often the point where the next few are going to really engage that muscle. Don't stop because it gets harder, that's just cheating yourself; stop before failure, you don't want to be dropping weights or injuring yourself because of bad form. Learn to recognize the difference.
- If at the end of the "prescribed" reps you could keep going, then you would likely benefit from increasing your weight.
Here's what I tell people that I train:
"I can only coach you; I can NOT do the work for you. You need to be honest about what you want from the workout. If you want to phone it in and not push out of your comfort zone, then you are going to be in the same position six weeks, six months, a year from now. It's your workout, make it matter."
I had two participants in a group resistance class who came to me and said "it's not as difficult as it used to be...." to which I responded "I have been suggesting to you for weeks to increase your weights and challenge yourself. Will you trust me and increase your weight by 2 stacks (based on the Kinesis system we use)?"
They did and after the 25 minute tabata-based class (five four-minute rounds of 20/10 circuits), they were spent! Literally on the floor panting and recovering. These are fairly fit people who were simply not challenging themselves.
Unless we make an active choice to challenge our own levels, it is very easy to slip into a mode of thinking we're working hard when we are not.
If you are finishing your workout and then skipping around right off, then you left some potential progress on the table during your workout.
With the new Turbo Fire workout (from Turbo Jam's Chalene Johnson) which is based on High Intensity Interval Training (HIIT), she mentioned in a video somewhere (can't put my hands on it): "You should not do the HIIT workouts (from TF) every day. If you can do it every day, then you are not doing it right." (paraphrased)
Quality workouts beat quantity every time. Unless you are training for something specific (or a specific managed weight loss program), it is rare to need to workout for 60+ minutes every day.
I see people spend 90-120 minutes+ a day at the gym 5-7 days a week, and if they asked, they could improve their results in less than half the time, but somewhere along the line people have learned the misperception that more equals better and harder.
As another example, I had a "regular" from the free weight room that joined me during a personal workout: tabata-based kettlebell workout with me. This includes five 4-minute rounds of work. Each round is comprised of eight 20 second cycles of intense activities with 10 seconds of rest between. That's right: you can do anything for 20 seconds, right? Anyway, this heavy weight lifter who was only using a kettlebell that was 5 pounds heavier than mine barely made it through 3 rounds (that's 12 minutes plus a minute of rest between rounds.)
It's not about what we are doing; whether we're challenging ourselves is more important and there's only one person that knows the true answer to that: you.
Sorry for going on and on, these are just some of my thoughts from years of instructing and training.