Ohhhhh----I've been feeling the same way lately. I've been lifting heavy (for me) since my mid twenties. Although when I went to acupuncture school, I only lifted moderately twice a week, and did Kundalini yoga almost daily. Then after I graduated, went back to lifting heavy with Cathe again. Now in my forties, I'm feeling depleted. Today I did gymstyles Chest and Tris and in the midst of lifting heavy Chest, I thought to myself, this is torture, this is so hard on my body and my joints.
I already started to add more Power Yoga sessions to my regimen, but I'm afraid of losing muscle tone. I've worked hard for muscle, yet I'm tired of working so hard all the time.
I'm thinking of just doing 2 circuits or full bodies and maybe 1 day of heavy legs a week and alternate with power yoga sessions 2 or 3 times a week and doing shorter power yoga or gentle yoga in the morning to wake me up (maybe 1/2 hour's worth)
Chaz from Yoga zone (free video podcast) - there is a new 20 minute video yoga podcast session every week - Well anyway, he says that he chose yoga as his main form of exercise because with yoga, he can only get better and better at it as he grows older. With other forms of sports or exercise, you reach peak performance (at a certain age) and then as you grow older, you can no longer work at that intensity level. So, I'm really thinking about it.
Maybe, once in a while, I will do heavy weighted work outs, just to switch things up, and just for the fun of it.
But I think I'm going to try to be a little more gentle on my body. I'll still throw in some step, or kick boxing during the week, for cardio's sake (I like at least two sessions a week).
I've also added some Qigong in the morning for an extra energy boost before I do my yoga to prepare me for my work day.