And this is why when I started I tried finding the gym near Grove St. that I used extensively in GTA:SA, and was sorely disappointed. Even if they made it super difficult to raise the strength stat, I'd still use the gym for a while (maxed strength and stamina in SA before doing any missions after gaining access to the gym, so I wanted to see how they'd change it in V... and hopefully looking for those guys I could beat for the extra melee moves. Great job R* for taking out one of the things that was only in SA and I missed in IV)
Granted melee kills are easy enough, and increased strength would just make fistfights faster (does it really affect anything else?), but getting maxed stats is something most gamers strive for as soon as possible, and the lack of direction and/or ability to get the training done is a little unfortunate.
As for the comment about one yoga session maxing one's strength, I did the yoga mission and immediately after did a session next to my pool. My strength with Michael (even after several hours of gameplay afterward, albeit with about evenly split time between members) is still under 30%. Are you talking about the sessions available at other places not at Michael's lanai? I can't see how that would be any different, so you must've done something else to boost your strength besides yoga. (that and I'm not sure why stretching and breathing would improve one's strength, just stamina and flexibility, and maybe lung capacity)