Deleting something added correctly by a competent mapper and replacing it with lower quality mapping is essentially vandalism and far more detrimental than your usual habit of adding duplicates. Reverted.

Repaired in changeset/164181748

Repaired in changeset/164181626

Repaired in changeset/164181494

Repaired in changeset/164181362

Repaired in changeset/164180998

Repaired in changeset/164180913

Already mapped correctly as relation/14028718
Repaired in changeset/164180752

Done in changeset/164175528

Reverted in changeset/164170120

Reverted in changeset/164170120

Reverted in changeset/164170120

Reverted in changeset/164170120

Reverted in changeset/164170120

Reverted in changeset/164170120

Reverted in changeset/164170120

Already mapped correctly as relation/13401608

The grass infield isn't a running track. I remember it quite distinctly from the last time I ran there.

Already mapped as relation/2723886

Already mapped as relation/2725261 (although neither the inner member of the relation nor your duplicate accurately separate the 400m inner boundary of the running track from the jumps area)

Already mapped as relation/1634345 (although it has an unusual value for the surface tag)