Need Routine that doesn't involve legs

[hrg217]

Long story short, been lifting weights for a while, but have been traveling last 6 months with no access to weights and lost 15 lbs of muscle, so am currently not too strong. I would look to a beginner routine, but all on this site involve legs (as they should), but I unfortunately have knee issues (similar to arthritis) and can't do much lower body. I'm looking for a routine, preferably 4-day per week, to build a base layer of muscle. Any advice for a routine or where to find one? Thanks

[MRTOEHEADJR]

If you find a 5 day split just ignore the leg day and it will become a 4 day split.

[Vygotsky]

You can do starting strength without the squats, deads, or power cleans.

Or my workout when I had a knee injury for example:

1. Bench press
2. sitting BB shoulder press
3. some type of rows ---> BB and DB hurt (T-bar machine, cable)
4. Weighted pull ups
5. Another movement.

Long story short, been lifting weights for a while, but have been traveling last 6 months with no access to weights and lost 15 lbs of muscle, so am currently not too strong. I would look to a beginner routine, but all on this site involve legs (as they should), but I unfortunately have knee issues (similar to arthritis) and can't do much lower body. I'm looking for a routine, preferably 4-day per week, to build a base layer of muscle. Any advice for a routine or where to find one? Thanks