I am a guy who started workout at home few years back, thanks to the youtube gurus, gym goers in forums, I managed to lose some fat and lift some weights. I did try to get a membership from commercial gyms and in the negotiation period, they do mention that " Sir if you would want to reach your target goals ( at that time was 75kg from 96kg), you need at least a year." And I was like " Hell, I can do better than that at home." So I spend more on the weight plates and trained harder at home. Then I entered Uni and worked in my hostel gym. I was like the only guy who deadlift there, who clean the barbell overhead and do a squat and when guys are banging the steals on a Marc Fitness Machine, I do a slow n steady wide grip pulldown with 8 plates on. My friends are all impressed and I feel so damn freaking good. I started to workout in the gym everyday I can. Doing a 5 days rotate, more than 4 exercises per body part, more than 4 sets per exercise. Spend more than 90 mins in the gym, sweat hard, breathe hard and I think I am going to be fit soon. Months after months, when I'm home, my sister still asked me the same question "where's your 6 packs"... Something must have gone wrong isn't it?

Until weeks ago, I went to check out a ghetto gym. The owner asked whether he can train me. Of course I accepted. 1st day was Leg Day. I was told to do 4 exercises, 4 set each. And I feel like "Bingo! As what I always do!". Then I was asked to squat with an empty olympic barbell as many reps as I want as warm-up, then I was teach to correct my hand grip and the bar placement, then plates started load in. So 1st working set is 36kg total, I done 15 reps with moderate effort. And I was told that I have 30 sec rest time. I felt like " Crap! why 30 sec? I should have longer time. I train for hypertrophy, the forums, the gurus and the seniors all said best rest interval is 1 - 2 min. And then in this 30 sec I was asked to load another 20kg, and 15 reps to go as well. I sweared in my heart " This guy is a noob, 15 reps training is for endurance not body building." And I done the 15 reps, this time I breathe hard. I was asked to load another 10kg in the 30 second rest time goes for another 15 reps. And end up I couldn't finish 66kg for 15 reps, I end at 10, I almost felt I would drop the weight. 30 sec later, I oni manage to complete a 10 reps 55kg again. I felt like shit, I used to squat a 80kg for 8 reps on my normal workout. The trainer didn't allow me to think more, 30 sec later, I am asked to complete walking lunge 50 steps. I used to do weighted lunge, but this time my thighs are really killing me, I strugglled thru the set, the last 2 set of leg extension and seated calf raise. All with 30 second rest time between sets, total 4 sets 15 reps, didn't expect it would be a drop weights set, but my thighs doesn't allow me to finish all sets with the same weights. All the weights used is less than 75% of what I used to do or I used to "think" I can do.

The trainer screwed me up and I thought I would never go back to that gym again but I did for following weeks. From the simple as bicep curl, to the more complex compound move like chins, squats and presses. All the weights I can lift in the 4 sets "try to reach 15 reps" are less than what I used to do. Complete 4 exercise and total of 16 sets 10~15 reps, it now took me only 30 minutes maximum, compared to last time my football match workout. I feel much more sore and yes soreness doesn't mean I grew or whatsoever, but I notice I now feel more muscle engage and involvement in the workouts. And at least i notice changes on my body and energy level

As a medical professional, only a small amount of us will have sympathy towards injuries that is created by ownself. If you involve in an accident, we will have sympathy to you and your family.
ETC :

This is a tear in muscle, and you will need a surgery to repair it, depends on the level . If you lift too heavy with improper form, you might get a tear in your muscle. It is your own mistake that lead to this, you can only blame youself, right ?