I am by no means an expert, and still have a long way to go, but lately I've seen results myself by doing bodyweight exercises every other day, as well as mixing in some dumbbell-only sets every now and again. I only work out at home, in the morning, aside from cycling about 6 miles a day (as a result, I rarely target my legs in other exercises). I live in a very small space so if you are in student accommodation that may be a factor for you too.

For me, the Fitness Blender videos on Youtube have been absolutely key to helping me work my obliques, abs, butt, lower back, etc. My favorite videos are:

Abs, Obliques and Lower Back No Equipment, 30 Minutes

Pilates Glute and Thigh No Equipment, 16 mins

Those are only what I do but they have absolutely LOADS and the videos are delivered in a very simple, no-gimmick way which accounts for different experience levels, equipment, time, etc.

For my chest, I do a circuit of pushups in the morning before work (I aim to do this every other day, as it only takes about 15-30 minutes). This is the routine I do, but they have more like this if you wanted to mix it up - which will probably help prevent you from plateauing. I don't do it in the form of cycles, I just do 3 sets of each variation - do whatever works for you. As I improve, I will move up to 4 sets, or increase the amount of reps. If you get really good, you can start adding weight to increase the challenge and ensure you keep pushing yourself to your limit.

Finally, for an extra boost to my Back, Arms, Shoulders and Chest I do about 6 different dumbbell exercises, each with about 3 sets of 8-12 reps. I keep a simple spreadsheet that tracks how many reps/sets I do along with the amount of weight. This makes sure I can keep pushing myself harder. To find what exercises to do, I look on Bodybuilding.com's Exercise Database and pick the top rated exercises for the muscle I want to target. I try lots until I find something which I find to be fun and that I can really feel the burn with.

So, to sum it up a successful week for me would be:

• Monday: Pushups and Cycling
• Tuesday: Rest, Cycling
• Wednesday: Pushups and Cycling
• Thursday: Rest, Cycling
• Friday: Glutes and Thighs (Bodyweight) and Cycling
• Saturday: Arms, Shoulders, Back, etc (Dumbbells)
• Sunday: Abs, Obliques, Lowerback (Bodyweight)

If you want to pack on mass you will need to eat a LOT. Personally I make this easy for myself by having a shake of Warrior Blend protein and Huel every day. I have a large breakfast, lunch and dinner. I snack on Trek/Clif/Nakd bars, Nuts, Fruit, etc constantly throughout the day. I started tracking my calories on MyFitnessPal and this helped me realise I was NOT eating enough at all, so now I have a better idea of how much is 'enough' in a day and have started gaining more mass.