How much energy do you expend in a session?

@Spanishguy69 Apart from the muscles involved in breathing, and the ones used to move my index fingers to stroke my nipples, my entire body is relaxed. If I experience particularly strong orgasms, I may arch my back briefly. As a consequence, the amount of energy expended is minimal.

I'm now mostly having sessions without the aneros as I feel I can relax more without it, but after some of my sessions I feel like having a protein shake. I relax as best my body allows me to, but there have been cases where I wear out my abs and calf muscles thinking the shaking/tensing is getting me somewhere...but I also think that means the energy is getting redirected to the wrong areas. I mean I let my body do what it does, but it feels like I should be relaxing a little more - but then I try to relax and things don't go anywhere after that.

My sessions are probably about 2 hrs long, but often I am exhausted. I try to stop before I get frustrated.

not sure how much i spent
to me, i feel like i am getting a 15-20 min of moderate exercise in about an hour of session that i usually had
during strong orgasm which i usually had around 4-5 times per session, almost all of my muscles tensed up and i lifted and thrust my pelvic up in the air. that alone workout my butt and back muscles.
after that, i got my lower back, neck and buttock muscles ache for like 2 days

Older post where I did some HR analysis using a heart rate monitor. https://community.aneros.com/community/general-discussion/heart-rate-and-aneros-fun-with-data

For a long time, I used to have sessions that used to last two hours, if not 2.5 hours. That was when I was in the beginning stages of my Aneros journey as I was developing facility for using my Aneros models as well as developing the strength of my PC muscle and anal musculature through the Kegels during sessions! There were some sessions that I would come away absolutely exhausted.

Since then, and especially in the last year and half, I have learned to relax a great deal. Relaxation has enable me to enjoy my sessions a great deal. Since experiencing my first bona fide Super-O's and MMO's a few weeks ago, my sessions have become seemingly effortless. Likewise in recent weeks a typical session lasts about an hour.

Now, although I come away from my sessions with absolutely delicious Aless, there is a refraction time of a least a day for recovery. It is similar to sports or working out. You just need time to recover.

my body tenses up on its own I have no control over it during my dry Os or other prostate session sensations! I don't get very tired or worn out from anything sexual, even after sex for 30+ minutes straight, I'm up and ready to do something afterwards. I do feel very relaxed and a bit of a "worn out" feeling like I just woke up from a long nap, but not overly tired.