Yuka's temptation is heavy

The gym they went to was one of the most famous gyms in the entire country, dedicated to serving gym-goers with high-quality equipment that was meticulously cleaned and maintained with great frequency, along with trainers both friendly and experienced in their work, providing top-notch guidance on exercise routines and diets according to each gym-goer's different lifestyles. Its name was Silverbro Gym, and here your physical destiny would (officially) take shape.

There was just one problem: The gym was super crowded.

"Ah, crap. I think we ended up arriving at the super core time period..." Yuka sheepishly said.

In gym terms, super core time referred to the equivalent of rush hour, where gyms would experience a huge influx of gym-users that crowded the entire facility. It would usually take place around 12 o'clock and last for an hour before the period ended. It was also considered a place for young men and women to meet and potentially become prospective couples.

"We couldn't come earlier or later?" You asked.

"Well, one of my juniors at work suddenly called in sick, so I had to adjust my usual gym timing for today," Yuka explained, "It sucks, but it is what it is."

"I see many machines sitting unused, though," You pointed out.

As you stated, the machines themselves sat abandoned with not a single user interested in them, the customers preferring light dumbells or cardio machines from the treadmill to the cycling machine and the eliptical, whereas strength training machines like the leg press and lat pulldown machines sat abandoned.

"Well, they're not actually interested in a proper workout in this case, both because of time constraints and the fact they're treating the gym more like a hangout spot," Yuka explained with a shrug, "At least this means we've got the strength training machines to ourselves."

And considering Yuu's admittedly weak physical state, it'd be better to start with the machines first.

"What should I start with first, though?" You asked, "Is there an order to follow?"

"No, not really. We can start with the cable machine and leg press first, then move on to other machines. One fundamental thing to know though is that you shouldn't overly focus on training one part of your body, or you'll have muscle imbalance," Yuka pointed out, guiding you to the cable machine, "It'll look really ugly, and... well, people will make fun of you for that."

"Speaking from experience?" You asked.

"From memory," Yuka corrected.

As she helped you adjust the cable machine, setting it to the correct arrangement and adjusting the weight, she lean in close to adjust your posture in turn. This made Yuka's ample chest press snugly against your arms and back, and you feigned ignorance while maintaining a poker face, though a certain part of you responded in kind.

Yuka simply smiled and feigned ignorance in turn, or at least initially it looked that way to others. She did move to whisper into your ear in a low, sultry voice.

"If you get through the entire routine I set up for you today, I'll give you a special reward."

Eager to sate your desires and test your newfound cock size, you readily agree with an enthusiastic smile.