In the last month I’ve started hitting to gym to lean up my fat ass; while in the last months my lifts have all gone from “struggling with the bar” to 100-140lbs, my motivation is more or less purely physical vanity.
Though this might not apply to your situation specifically, I’m still mildly surprised when someone blushingly confesses to me that their motivation is aesthetic, as if it’s somehow less noble of a goal or motivation than health or athletic performance. In the same way exercising for better health and longevity could be attributed to selfish motivation (because you personally want to live longer or better), or likewise could be for others (because you do not want to be a medical burden on your family or society), you can likewise consider aesthetic reasons to be for the benefit of others (so that your children don’t grow up with a weak, fat parent as their role model, or so that your significant other can continue to find you attractive and enjoy you physically as well as mentally and emotionally). I’m not one to break each and every little thing down to subjective reality, but you can call the motivation anything you want so long as it gets you where you ultimately want to go.
For example, I’m motivated to see everyone succeed because every person who is obese is a financial burden on myself and my society. I’m also motivated because I have plenty of friends and loved ones who are overweight or obese, and suffer not only medically, but emotionally and mentally.
What ultimately matters to me is that as many people who want to help themselves can do so, and I’m doing that in the best way right now that I know how. But my motivations aren’t as important as the end goal, and yours don’t have to be either.
However I hate the hassle of actually going to the gym so the idea of keeping a sandbag in my closet I can use in my apartment in the morning is extremely appealing.
I would caution you that though (or perhaps because) it is more convenient, you will need more motivation to convert to working out at home, not less.
Though it’s a method I recommend, having a sandbag in your closet is an easy thing to go “Oh I’ll just do it tomorrow, I deserve to take it easy today because of [reason here].” The engineer bag can be an incredible tool and can readily serve as a universal one for people who need it to do so; just don’t let it enable you to make excuses and eventually fail yourself in your ultimate goal. Again, that may not be your problem, but we’re all different.
Now, I’m 6’2″. Is a bag full of sand that maxes out at 160lbs going to be enough of a stimulus to give me decent-sized musculature (once I drop enough fat to have it become visible, of course)?
Time and again, athletes are shocked when they find out an engineer bag they’ve been struggling with might only weigh 100lbs. The reason barbells became so popular is because of the fact it’s efficient, that the body can best grasp that weight and manipulate it in that form, where it’s as compact and unencumbering as it can be. That’s why things like fatbars/fat grips and kettlebells are so en vogue; they take a weight and make it unwieldy and thereby more challenging. Bagging weight takes it that step further, especially if you are gripping the canvas itself rather than the convenient handle or cradling it. It’s a pain in the ass to lift and move, and the more obnoxious it is, quite frankly, the better it can be.
If you can fill a bag completely and are knocking out all your movements like it’s no thing, simply get another bag and either load them both up on your arms zercher-style, put one on each shoulder, or carry one under either arm. If you’re at 300+lbs in sandbags and you’re still feeling unchallenged, at that point you might look into a gym membership. And probably competing at a serious level of sportsmanship.